Villanueva v. Becerra CA5 ( 2021 )


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  • Filed 1/14/21 Villanueva v. Becerra CA5
    NOT TO BE PUBLISHED IN THE OFFICIAL REPORTS
    California Rules of Court, rule 8.1115(a), prohibits courts and parties from citing or relying on opinions not certified for
    publication or ordered published, except as specified by rule 8.1115(b). This opinion has not been certified for publication
    or ordered published for purposes of rule 8.1115.
    IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA
    FIFTH APPELLATE DISTRICT
    DANNY VILLANUEVA et al.,
    F078062
    Plaintiffs and Appellants,
    (Super. Ct. No. 17CECG03093)
    v.
    XAVIER BECERRA, as Attorney General, etc.                                                OPINION
    et al.,
    Defendants and Respondents.
    APPEAL from a judgment of the Superior Court of Fresno County. Mark W.
    Snauffer, Judge.
    Michel & Associates, C.D. Michel, Anna M. Barvir, and Sean A. Brady, for
    Plaintiffs and Appellants.
    Xavier Becerra, Attorney General, Thomas S. Patterson, Senior Assistant Attorney
    General, Paul Stein and P. Patty Li, Deputy Attorneys General, for Defendants and
    Respondents.
    -ooOoo-
    In 2016, the California Legislature closed a loophole in the Roberti-Roos Assault
    Weapons Control Act (Pen. Code,1 §§ 30500, et seq., AWCA) by revising the statutory
    definition of assault weapons to include a class of weapons that were previously outside
    of AWCA’s coverage, commonly known as “bullet-button” assault weapons.2 (Sen. Bill
    No. 880 (2015-2016 Reg. Sess.) (Senate Bill 880); Stats. 2016, ch. 48, § 1, amending
    §§ 30515, 30900, adding 30680, eff. Jan. 1, 2017.)3 Under the revised law, those who
    lawfully owned bullet-button assault weapons before the effective date of the statutory
    revision (i.e., Jan. 1, 2017) could keep them, subject to a requirement that all such
    weapons had to be registered by July 1, 2018.4 (§§ 30900, subd. (b); 30680.)
    Additionally, and important to the present appeal, the California Department of Justice
    (DOJ) was directed to adopt regulations to implement the new registration requirement,
    and such regulations were expressly declared to be exempt from the Administrative
    Procedure Act (Gov. Code, § 11340 et seq., APA). (§ 30900, subd. (b)(5).) For
    1     The full title of the statutory scheme is the “Roberti-Roos Assault Weapons
    Control Act of 1989 and the .50 Caliber BMG Regulation Act of 2004.” (Pen. Code,
    § 30500.) Unless otherwise indicated, all further statutory references are to the Penal
    Code.
    2      A “bullet-button” weapon is designed to require a tool such as a bullet to remove
    the ammunition feeding device or magazine, usually by using the tool or bullet to depress
    a recessed button or lever shielded by a magazine lock. (See Cal. Code Regs., tit. 11,
    § 5471.)
    3      Additionally at Assembly Bill No. 1135 (2015-2016 Reg. Sess.) (Assembly Bill
    1135.) (See Stats. 2016, ch. 40, § 3; see also Assem. Com. on Public Safety on Sen. Bill
    No. 880 (2015-2016 Reg. Sess.) as amended May 17, 2016 [purpose of law’s revision is
    to remove bullet-button loophole]; Sen. Com. on Public Safety on Sen. Bill No. 880
    (2015-2016 Reg. Sess.) as amended March 28, 2016 [same].)
    4      The registration deadline was originally January 1, 2018, but it was subsequently
    changed to July 1, 2018. (Assem. Bill No. 103 (2016-2017 Reg. Sess.) (Assembly Bill
    103); Stats. 2017, ch. 17, § 49.) If the registration requirements were met, an individual’s
    lawfully owned bullet-button assault weapons would be grandfathered in and allowed.
    (§ 30680.)
    2
    convenience, we refer to the above described revisions to AWCA by its 2016 legislative
    bill number -- Senate Bill 880.5
    The DOJ proceeded to adopt new registration regulations for registering bullet-
    button assault weapons, as required by Senate Bill 880. (See Cal. Code Regs., tit. 11,
    §§ 5469-5478.)6 Plaintiffs7 then filed the present action challenging the validity of the
    new regulations on two main grounds: (1) the regulations allegedly exceeded the scope
    of the statutory exemption from the APA and therefore had to comply with the APA, and
    (2) certain of the regulations allegedly sought to impermissibly enlarge or vary the
    statutory definition of assault weapons. The trial court rejected plaintiffs’ challenge in
    toto, finding that the regulations adopted by DOJ were reasonably related to the purpose
    of implementing the registration requirement and did not exceed the scope of DOJ’s
    regulatory authority. Plaintiffs now appeal, raising substantially the same issues as were
    presented in the trial court. We conclude the trial court correctly ruled. The subject
    regulations came within DOJ’s statutory exemption from the APA and are reasonably
    consistent with AWCA’s governing statutes. Accordingly, the judgment of the trial court
    is affirmed.
    5     We recognize there was a parallel bill in the State Assembly, i.e., Assembly Bill
    1135, which provided the same statutory revisions as Senate Bill 880. For ease of
    expression, we refer simply to Senate Bill 880 (rather than to both bills) in identifying the
    new law.
    6      We refer to the challenged regulations as the registration regulations, or simply the
    regulations.
    7      Plaintiffs are individual gun owners (Danny Villanueva, Niall Stallard, Ruben
    Barrios, Charlie Cox, Mark Stroh, Anthony Mendoza) and an association (California
    Rifle & Pistol Association, Incorporated) that are allegedly impacted by the new
    registration regulations.
    3
    FACTS AND PROCEDURAL HISTORY
    Bullet-Button Assault Weapons
    Under the former version of AWCA applicable before Senate Bill 880 took effect,
    the question of whether certain semi-automatic weapons were classified as assault
    weapons depended on, among other things, whether the weapons had “the capacity to
    accept a detachable magazine.” (See former § 30515, subd. (a)(1), (a)(4); Stats. 2016, ch.
    48, § 3.) A “ ‘detachable magazine’ ” was defined as any ammunition feeding device that
    could be removed readily from the firearm “with neither disassembly of the firearm
    action nor use of a tool being required.” (See former Cal. Code Regs., tit. 11, § 5469,
    subd. (a); cf. Cal. Code Regs., tit. 11, § 5471, subd. (m).) A bullet or cartridge was
    considered a tool. (See former Cal. Code Regs., tit. 11, § 5469, subd. (a).) As a result of
    these definitional standards, where a tool such as a bullet was needed to remove the
    magazine, there was no detachable magazine and the weapon was technically not an
    assault weapon under AWCA, even if in all other respects it could function as an assault
    weapon. This created what was referred to in the legislative committee reports relating to
    Senate Bill 880 as the “bullet button loophole.” (See, e.g., Sen. Com. on Public Safety on
    Sen. Bill No. 880 (2015-2016 Reg. Sess.) as amended March 28, 2016, pp. 5-8; Assem.
    Com. on Public Safety on Sen. Bill No. 880 (2015-2016 Reg. Sess.) as amended May 17,
    2016, pp. 1-6.) The same legislative committee reports reflected a concern that weapons
    which are otherwise functionally the same as illegal assault weapons should not be
    excluded from coverage under AWCA merely because a small tool or bullet is used by
    the gun owner to quickly eject and reload ammunition magazines. It was expressed by
    the bill’s author that unless the bullet-button loophole is closed, “the assault weapon ban
    is severely weakened, and these types of military-style firearms will continue to
    proliferate on our streets and in our neighborhoods.” (Assem. Com. on Public Safety on
    Sen. Bill No. 880 (2015-2016 Reg. Sess.) as amended May 17, 2016, p. 3.)
    4
    Senate Bill 880 Closes the Bullet-Button Loophole, Requires Registration
    As noted, in Senate Bill 880 the Legislature closed the bullet-button loophole as to
    particular types of semi-automatic weapons, effective January 1, 2017. It did so by
    modifying the definition of what would constitute an assault weapon under certain
    provisions of section 30515. Under the former wording of subdivision (a)(1) and (a)(4)
    of that section, either a semi-automatic centerfire rifle or a semi-automatic pistol that
    possessed one or more other specified features or attributes would constitute an assault
    weapon if the weapon also had the “capacity to accept a detachable magazine.” (See
    former § 30515, subd. (a)(1), (a)(4); Stats. 2016, ch. 48, § 3.) As we have explained, this
    created a loophole for certain weapons because a magazine was not considered
    “detachable” if a simple tool such as a bullet had to be used to remove it. Under the
    revised statutory definition created by Senate Bill 880, the phrase “the capacity to accept
    a detachable magazine” was deleted from subdivision (a)(1) and (a)(4) of section 30515
    and replaced with the words “does not have a fixed magazine.” (§ 30515, italics added;
    Stats. 2016, ch. 48, § 3.) Moreover, the term “ ‘fixed magazine’ ” was expressly defined
    to mean “an ammunition feeding device contained in, or permanently attached to, a
    firearm in such a manner that the device cannot be removed without disassembly of the
    firearm action.” (§ 30515, subd. (b).) As the latter definition reflects, the mere use of a
    tool to quickly remove the magazine would no longer create an exception. In other
    words, under Senate Bill 880, bullet-button weapons would no longer be automatically
    excluded from the definition of assault weapons under section 30515, subdivision (a)(1)
    and (a)(4), since a magazine that is easily removable with a bullet or other small tool
    plainly “does not have a fixed magazine” as that term is defined under the new law.
    The second major part of Senate Bill 880 was to provide a mechanism to
    grandfather the bullet-button assault weapons that were lawfully owned in California
    prior to the new law. This was largely accomplished through a registration requirement
    set forth in a newly added subdivision (b) to section 30900. (Stats. 2016, ch. 48, § 3.) As
    5
    provided in section 30900, subdivision (b), the new registration requirement was as
    follows:
    “(1) Any person who, from January 1, 2001, to December 31, 2016, inclusive,
    lawfully possessed an assault weapon that does not have a fixed magazine, as
    defined in Section 30515, including those weapons with an ammunition feeding
    device that can be readily removed from the firearm with the use of a tool, shall
    register the firearm before July 1, 2018, but not before the effective date of the
    regulations adopted pursuant to paragraph (5), with the department pursuant to
    those procedures that the department may establish by regulation pursuant to
    paragraph (5).
    “(2) Registrations shall be submitted electronically via the Internet utilizing a
    public-facing application made available by the department.
    “(3) The registration shall contain a description of the firearm that identifies it
    uniquely, including all identification marks, the date the firearm was acquired, the
    name and address of the individual from whom, or business from which, the
    firearm was acquired, as well as the registrant’s full name, address, telephone
    number, date of birth, sex, height, weight, eye color, hair color, and California
    driver’s license number or California identification card number.
    “(4) The department may charge a fee in an amount of up to fifteen dollars ($15)
    per person but not to exceed the reasonable processing costs of the department.
    The fee shall be paid by debit or credit card at the time that the electronic
    registration is submitted to the department. The fee shall be deposited in the
    Dealers’ Record of Sale Special Account to be used for purposes of this section.
    “(5) The department shall adopt regulations for the purpose of implementing this
    subdivision. These regulations are exempt from the Administrative Procedure Act
    (Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2
    of the Government Code).”
    As the foregoing statutory provisions make clear, persons who prior to January 1,
    2017, had lawfully possessed an assault weapon that “does not have a fixed magazine,”
    including weapons with a magazine that “can be readily removed from the firearm with
    the use of a tool” – in other words, bullet-button assault weapons – had to register them
    before July 1, 2018. (§ 30900, subd. (b)(1).) To implement this registration requirement,
    6
    DOJ was directed in the statute to adopt regulations, and such regulations were declared
    to be exempt from the APA. (§ 30900, subd. (b)(5).)
    Finally, under Senate Bill 880, section 30680 was enacted. This section created an
    exemption from the application of section 30605 (the prohibition against the possession
    of an assault weapon) for persons who lawfully possessed bullet-button assault weapons
    prior to January 1, 2017, if they timely satisfied the registration requirements of section
    30900 as set forth in section 30680. (§ 30680.)
    DOJ Adopts Registration Regulations
    DOJ adopted new registration regulations for registering bullet-button assault
    weapons, as required by Senate Bill 880, and the regulations were duly published by the
    Office of Administrative Law. The new regulations became effective on July 31, 2017,
    and are published at California Code of Regulations, title 11, sections 5469 through 5478.
    Said regulations cover the following topics or subject matter: a description of the types
    of weapons that must be registered and definitions of the statutory terms governing the
    registration requirements (Cal. Code Regs., tit. 11, §§ 5470-5472); the process for
    registering via DOJ’s website and the information required to be provided (Id. §§ 5473-
    5474)8; joint registration requirements (Id. § 5474.1); serial number requirements for
    registering homebuilt weapons (Id. § 5474.2); the required registration fee (Id. § 5475);
    the deadlines for submitting registrations and complying with requests for additional
    information or documentation (Id. § 5476); the prohibition on illegal modifications to
    registered weapons (Id. § 5477); and the process for voluntary deregistration (Id. § 5478).
    Plaintiffs Action Filed in Trial Court Challenging Regulations
    On September 7, 2017, plaintiffs filed their complaint in the trial court challenging
    the registration regulations adopted by DOJ. The defendants named in the complaint
    8      It appears that section 5473 of title 11, California Code of Regulations, was
    repealed in 2019.
    7
    were Xavier Becerra, in his official capacity as Attorney General for the State of
    California, Stephen Lindley, in his official capacity as Chief of the DOJ Bureau of
    Firearms, and DOJ (collectively DOJ or defendants). The complaint alleged causes of
    action for declaratory and injunctive relief on the grounds that the regulations (1)
    exceeded the scope of the limited APA exemption stated in section 30900, subdivision
    (b)(5), by attempting to do more than implementing a registration program for bullet-
    button assault weapons, and (2) sought to impermissibly expand the statutory terms in
    AWCA. Among other things, the complaint asserted that the new regulations added
    numerous definitions of terms (while deleting others) and imposed requirements
    allegedly unrelated to the registration of bullet-button assault weapons. Allegedly, to the
    extent such regulations went beyond the subject of implementing a registration program
    for bullet-button assault weapons, the APA statutory exemption did not apply and DOJ
    was required to follow the formal public comment process of the APA. Additionally, the
    regulations also allegedly exceeded DOJ’s authority by including bullet-button shotguns
    in the definition of assault weapons, even though Senate Bill 880 had only referred to
    bullet-button rifles and pistols, not shotguns.
    DOJ filed a demurrer to the complaint, contending among other things that its
    determination to proceed under the statutory exemption from the APA pursuant to section
    30900, subdivision (b)(5), rather than going through the formalities of the APA process
    in adopting the new regulations, was a discretionary administrative decision that can be
    reviewed or challenged only through a writ of mandate, not declaratory relief. The trial
    court sustained the demurrer on that ground, with leave to amend to allow plaintiffs to
    “seek writ relief.” On March 21, 2018, plaintiffs filed an amended pleading – namely, a
    first amended verified petition for writ of mandate and complaint for declaratory and
    injunctive relief (the first amended complaint). While the underlying allegations were
    essentially the same, the first amended complaint added distinct claims seeking review by
    writ of mandate, including on the ground that DOJ abused its discretion by adopting the
    8
    new regulations on a “ ‘file and print’ ” basis (i.e., under the APA exemption), rather than
    doing so in accordance with the formal public comment process of the APA.
    Hearing and Order Denying Relief
    On May 25, 2018, a hearing was held in the trial court on plaintiffs’ first amended
    complaint to determine whether plaintiffs were entitled to a writ of mandate and/or other
    relief under the first amended complaint. Following oral argument, the matter was taken
    under submission. On May 30, 2018, the trial court issued its order denying the petition
    for writ of mandate and other relief. In its order, the trial court held that DOJ did not
    exceed its proper authority but acted within the parameters of its exemption from the
    APA. According to the trial court, the regulations adopted by DOJ reasonably
    implemented and properly filled in the details of the authorizing statute, thereby carrying
    out the intent of the Legislature that DOJ create a registration program for bullet-button
    assault weapons. Therefore, the trial court denied all relief and judgment was
    subsequently entered in favor of defendants. Notice of entry of judgment was filed on
    July 6, 2018. Plaintiffs timely filed their notice of appeal from the judgment.
    DISCUSSION
    I. Standard of Review
    As noted, the trial court’s ruling denied all relief under the first amended
    complaint, concluding the regulations did not exceed the scope of the APA exemption
    and were a reasonable and proper implementation of SB 880’s directive that the DOJ
    adopt registration regulations covering the bullet-button assault weapons. Plaintiffs’
    appeal argues the trial court erred in these conclusions. As explained below, our review
    is primarily de novo.
    We consider the proper standard for reviewing the action of a state agency in the
    present context. “Where, as here, the petition seeks a writ of mandate under Code of
    Civil Procedure section 1085, our review is limited to a determination of whether the
    agency’s decision was arbitrary, capricious, entirely lacking in evidentiary support,
    9
    unlawful, or procedurally unfair. [Citation.] Independent review is required, however,
    where the issue involves statutory or regulatory construction, such as whether the
    agency’s action was consistent with applicable law.” (California School Bds. Assn. v.
    State Bd. of Education (2010) 
    186 Cal.App.4th 1298
    , 1313-1314.) Since the present
    appeal involves statutory or regulatory review and/or the question of whether DOJ’s
    action was consistent with applicable law, we apply independent or de novo review.
    (Western States Petroleum Assn. v. Board of Equalization (2013) 
    57 Cal.4th 401
    , 415.)
    “[W]hen an implementing regulation is challenged on the ground that it is ‘in conflict
    with the statute’ [citation] or does not ‘lay within the lawmaking authority delegated by
    the Legislature’ [citation], the issue of statutory construction is a question of law on
    which a court exercises independent judgment.” (Ibid.) To the extent DOJ’s application
    or interpretation of law within its agency expertise is at issue, we exercise our
    independent judgment, but we also consider whether any deference to the determination
    of said agency is appropriate to the circumstances of the agency action. (Yamaha Corp.
    v. America v. State Board of Equalization (1998) 
    19 Cal.4th 1
    , 7-8.)
    If the APA is applicable to an agency’s adoption of regulations, any regulations
    that substantially fail to comply with the APA’s procedural requirements may be
    judicially declared invalid. (California School Bds. Assn. v. State Bd. of Education,
    supra, 186 Cal.App.4th at p. 1328.) Such APA questions of law are reviewed by this
    court de novo without deferring to the agency. (Sims v. Department of Corrections &
    Rehabilitation (2013) 
    216 Cal.App.4th 1059
    , 1071; California Advocates for Nursing
    Home Reform v. Bonta (2003) 
    106 Cal.App.4th 498
    , 506.)
    Plaintiffs also challenge the trial court’s demurrer ruling that required plaintiff to
    plead writ of mandate, rather than declaratory relief, for alleged failure to comply with
    the APA. The standard of review on appeal from an order sustaining a demurrer is de
    novo. (California School Bds. Assn. v. State Bd. of Education, supra, 186 Cal.App.4th at
    p. 1313; Blank v. Kirwan (1985) 
    39 Cal.3d 311
    , 318.)
    10
    II.    The Inclusion of Shotguns in the New Regulations – Issue Rendered Moot by
    Subsequent Statutory Amendment
    One of plaintiffs’ main contentions in the instant appeal is that the DOJ
    overstepped its authority when it included bullet-button shotguns in the registration
    regulations and required that such shotguns be registered as assault weapons by the July
    1, 2018 deadline. (See Cal. Code Regs., tit. 11, § 5470, subd. (d) [requiring registration
    of semi-automatic shotguns that have a bullet button].) The legal principle behind
    plaintiffs’ argument is that “agencies do not have discretion to promulgate regulations
    that are inconsistent with the governing statute, or that alter or amend the statute or
    enlarge its scope.” (Slocum v. State Bd. of Equalization (2005) 
    134 Cal.App.4th 969
    ,
    974; Ontario Community Foundations, Inc. v. State Bd. of Equalization (1984) 
    35 Cal.3d 811
    , 816-817; accord, Marshall v. McMahon (1993) 
    17 Cal.App.4th 1841
    , 1848.) In
    essence, plaintiffs are contending that DOJ’s inclusion of bullet-button semi-automatic
    shotguns impermissibly sought to expand or enlarge the scope of the governing statute’s
    definition(s) of assault weapons.
    In support of this argument, plaintiffs point out that Senate Bill 880 only revised
    the definition of assault weapons set forth in section 30515, subdivision (a)(1) and (a)(4)
    relating to certain semi-automatic rifles and pistols in order to close the bullet-button
    loophole as to those weapons; however, Senate Bill 880 did not make the same revision
    as to semi-automatic shotguns. (See Stats. 2016, ch. 48, § 1.) Thus, according to
    plaintiffs, the prior definitional standard for whether a semi-automatic shotgun
    constituted an assault weapon remained in effect, which was set forth in subdivision
    (a)(7) of section 30515 as follows: “A semiautomatic shotgun that has the ability to
    accept a detachable magazine.” (Former § 30515, subd. (a)(7); see Cal. Code Regs., tit.
    11, former § 5469, subd. (a), now § 5471, subd. (m) [defining “ ‘[d]etachable
    magazine’ ” as excluding a magazine removable with a bullet or other tool].) In a
    nutshell, plaintiffs maintain that because semi-automatic shotguns with a bullet button
    11
    were not redefined by Senate Bill 880 as assault weapons, DOJ went beyond the scope of
    the governing statute and exceeded its authority when it included them among the list of
    weapons that had to be registered as assault weapons under section 30900, subdivision
    (b).
    In response, DOJ asserts that the inclusion of bullet-button semi-automatic
    shotguns in the regulations implementing Senate Bill 880’s registration requirement was
    consistent with the overriding purpose of Senate Bill 880 to protect the public from
    dangerous bullet-button weapons, and in any event such inclusion was arguably
    permissible under the terms of section 30900, subdivision (b)(1), which describes the
    assault weapons to be registered as including “those weapons with an ammunition
    feeding device that can be readily removed from the firearm with the use of a tool.”
    Furthermore, DOJ argues that the inclusion of such shotguns in the registration
    regulations was within the bounds of its broad discretion to fill in the gaps of the
    legislation.
    Having framed the nature of this issue, we conclude that we need not reach it
    because the issue has been rendered moot by subsequent legislative amendment.
    Specifically, section 30515, subdivision (a)(7) was recently amended by the Legislature,
    effective August 6, 2020. Under that amendment, the statutory definition of an “assault
    weapon” was revised regarding shotguns by providing that an assault weapon shall
    include “[a] semiautomatic shotgun that does not have a fixed magazine.” (§ 30515,
    subd. (a)(7); Stats. 2020, ch. 29, § 38 (SB 118).) By replacing the words “has the ability
    to accept a detachable magazine” with “does not have a fixed magazine,” the 2020
    amendment conformed the wording of subdivision (a)(7) to that of subdivisions (a)(1)
    and (a)(4) -- the same wording used by the Legislature in Senate Bill 880 to close the
    bullet-button loophole in those provisions. Thus, the 2020 amendment to subdivision
    (a)(7) of section 30515 clearly added semi-automatic bullet-button shotguns to the
    statutory categories of weapons that would constitute assault weapons.
    12
    In light of this substantial change in the law, plaintiffs’ argument that DOJ’s
    registration regulations are improper to the extent the governing statute (i.e., § 30515)
    does not expressly define bullet-button semi-automatic shotguns as assault weapons is
    rendered moot or academic. That is, by virtue of the 2020 amendment revising
    subdivision (a)(7) of section 30515, AWCA now includes bullet-button semi-automatic
    shotguns in the definition of assault weapons. The former statutory deficiency, if any, or
    the former discrepancy between the governing statute and the regulations, if any, has
    been cured by the subsequent amendment. It is well established that an intervening
    change in the law may result in mootness. (See, e.g., Association of Irritated Residents v.
    Department of Conservation (2017) 
    11 Cal.App.5th 1202
    , 1222; Callie v. Board of
    Supervisors (1969) 
    1 Cal.App.3d 13
    , 18; County of San Diego v. Brown (1993) 
    19 Cal.App.4th 1054
    , 1089-1090; Bravo Vending v. City of Rancho Mirage (1993) 
    16 Cal.App.4th 383
    , 393 [in finding mootness, the version of law in force at present was
    applied on appeal].) This rule of mootness applies to cases pending on appeal. “‘Repeal
    or modification of a statute [or ordinance] under attack, or subsequent legislation, may
    render moot the issues in a pending appeal.’” (Callie v. Board of Supervisors, supra, 1
    Cal.App.3d at pp. 18-19.) That is manifestly the case here. Accordingly, due to
    mootness we decline to reach plaintiffs’ challenge to the regulations premised on the
    “shotgun” issue. (See Consumer Cause, Inc. v. Johnson & Johnson (2005) 
    132 Cal.App.4th 1175
    , 1183 [courts do not consider moot questions or abstract propositions].)
    III.   The Entire Appeal Will Not Be Dismissed as Moot
    DOJ argues that because the deadline for registration of bullet-button assault
    weapons has expired, the regulations governing the registration process are obsolete, and
    thus plaintiffs’ challenge to those regulations in the present appeal is rendered moot or
    academic. Accordingly, DOJ asks that we dismiss the entire appeal on the ground of
    mootness. We decline to do so, for two reasons. First, if plaintiffs’ claim in this appeal
    that the registration regulations are invalid is determined to be correct, it is unclear
    13
    whether that determination may potentially affect whether any of the purportedly
    registered bullet-button assault weapons have in fact been properly or lawfully
    registered.9 Proceeding with this appeal may thus prevent there being a cloud on the
    registrations that have occurred. Accordingly, the case is arguably not rendered moot by
    the mere passage of the registration deadline. Second, the APA serves an important
    public purpose of establishing procedures that provide security against bureaucratic
    tyranny. (See Morning Star Co. v. State Bd. of Equalization (2006) 
    38 Cal.4th 324
    , 333
    (Morning Star)). Due to the APA’s public importance, we think an alleged failure to
    comply therewith may, in a proper case, be considered on appeal even though a short
    administrative deadline arguably rendered the challenged regulations obsolete. (See, e.g.,
    Santa Monica Baykeeper v. City of Malibu (2011) 
    193 Cal.App.4th 1538
    , 1548
    [discretionary exceptions to mootness recognized, including where issue is one of public
    interest which may recur].) For these reasons, although we have applied mootness to a
    discrete issue or issues in this appeal due to a subsequent statutory amendment (see, e.g.,
    “shotgun” issue above), we decline to dismiss the entirety of plaintiffs’ appeal on the
    basis of mootness allegedly arising from the expiration of the registration deadline.
    IV.    The Regulations Were Reasonably Within DOJ’s Authority to Implement
    Bullet-Button Assault Weapon Registration, and Thus Were Exempt from the
    APA
    DOJ adopted regulations that implemented a registration process for the
    registration by July 1, 2018, of the newly defined bullet-button assault weapons under
    9       We note it is also not clear that all of the applications to register bullet-button
    assault weapons have been fully processed and determined by DOJ. We grant plaintiffs’
    request for judicial notice of DOJ’s response to a Public Records Act (Gov. Code, § 6250
    et seq.) request stating that, as of July 11, 2018, over 50,000 applications to register
    bullet-button assault weapons were still being processed. Plaintiffs also sought judicial
    notice of a pleading filed in a different case. That part of the request for judicial notice is
    denied, as the pleading is not relevant to any material issues in this appeal. (People ex
    rel. Lockyer v. Shamrock Foods Co. (2000) 
    24 Cal.4th 415
    , 422, fn. 2.)
    14
    Senate Bill 880. (See Cal. Code Regs., tit. 11, §§ 5469-5478.) Plaintiffs’ attack on the
    validity of these regulations is largely based upon plaintiffs’ contention that the subject
    registration regulations went beyond the scope of the APA exemption that was expressly
    provided in section 30900, subdivision (b)(5). Based on that assumption, plaintiffs
    further contend the adoption of the registration regulations necessarily had to comply
    with the APA’s procedural requirements, and DOJ’s failure to do so invalidates the
    regulations. As a preface to our consideration of plaintiffs’ argument, we briefly outline
    the following background principles of law: (1) the procedural requirements of the APA,
    and (2) the scope of DOJ’s reasonable discretion in adopting regulations.
    A. The APA’s Procedural Requirements
    The APA subjects proposed agency regulations to certain procedural requirements
    that must be met for the regulations to become effective. (Morning Star, 
    supra,
     38
    Cal.4th at p. 332; see Gov. Code, §§ 11340 et seq.) “‘If a rule constitutes a ‘regulation’
    within the meaning of the APA … it may not be adopted, amended, or repealed except in
    conformity with “basic minimum procedural requirements” (citation) that are exacting.”
    (Morning Star, 
    supra,
     38 Cal.4th at p. 333.) Any regulation or order of repeal that
    substantially fails to comply with these requirements may be judicially declared invalid.
    (Gov. Code, § 11350; Morning Star, 
    supra,
     38 Cal.4th at p. 333; accord, Morales v.
    California Dept. of Corrections & Rehabilitation (2008) 
    168 Cal.App.4th 729
    , 735-736
    (Morales).)
    Under the APA’s procedural requirements, if a proposed rule constitutes a
    regulation within the meaning of the APA, the following procedural steps must take
    place: “ ‘The agency must give the public notice of its proposed regulatory action
    [citations]; issue a complete text of the proposed regulation with a statement of the
    reasons for it [citations]; give interested parties an opportunity to comment on the
    proposed regulation [citation]; respond in writing to public comments [citations]; and
    forward a file of all materials on which the agency relied in the regulatory process to the
    15
    Office of Administrative Law (citation), which reviews the regulation for consistency
    with the law, clarity, and necessity.’ ” (Morning Star, supra, 38 Cal.4th at p. 333.)
    Unless expressly exempted, all administrative regulations must comply with the
    APA. (State Water Resources Control Bd. v. Office of Admin. Law (1993) 
    12 Cal.App.4th 697
    , 704; see Gov. Code, § 11346; see Pacific Legal Foundation v.
    California Coastal Com. (1982) 
    33 Cal.3d 158
    , 169, fn. 4 [noting “because the
    Legislature specifically exempted the guidelines from the provisions of [the APA],” no
    review under APA declaratory relief statute was available].) When the Legislature seeks
    to exempt regulations from the APA, it does so by clear, unequivocal language. (United
    Systems of Arkansas, Inc. v. Stamison (1998) 
    63 Cal.App.4th 1001
    , 1010.) Doubts as to
    the applicability of the APA’s requirements should be resolved in favor of the APA.
    (Morales, supra, 168 Cal.App.4th at p. 736.)
    Here, as noted, an explicit exemption from the APA was provided by the
    Legislature in section 30900, subdivision (b)(5). In section 30900, subdivision (b)(1)
    through (b)(4), which is the portion of the subdivision preceding the exemption language,
    the requirement is stated for bullet-button assault weapons to be registered by a certain
    date, including an electronic or internet “public-facing” registration format, and among
    other things it is specified that such registration process shall include the provision of
    information to uniquely describe and identify the firearm, the registrant’s identity, and
    shall include the payment of a fee. After these core registration contents are stated, the
    APA exemption states as follows: “The department shall adopt regulations for the
    purpose of implementing this subdivision. These regulations are exempt from the
    Administrate Procedure Act.” (Italics added.) Thus, it is clear the Legislature, in
    enacting Senate Bill 880, intended that regulations adopted by DOJ to reasonably
    implement the registration requirement would be exempt from the APA.
    16
    B. The Agency’s Broad Discretion
    For purposes of our review of plaintiffs’ challenge to the validity of the
    registration regulations adopted by DOJ, it is necessary to consider the nature of DOJ’s
    agency discretion, our standard of review thereof, and the degree of deference, if any, that
    should be shown.
    The California Supreme Court recently summarized the guiding principles for
    review of cases such as this, as follows: “‘Deference to administrative interpretations
    always is “situational” and depends on “a complex of factors” [citation], but where the
    agency had special expertise and its decision is carefully considered by senior agency
    officials, that decision is entitled to correspondingly greater weight.’ [Citation.] Where
    an agency’s action is ‘quasi-legislative’ or ‘the substantive product of a delegated
    legislative power conferred on the agency,’ the scope of our review is ‘limited to
    determining whether the regulation (1) is “within the scope of the authority conferred”
    [citation] and (2) is “reasonably necessary to effectuate the purpose of the statute”
    [citation.]’ [Citation.] By contrast, where an agency’s action is interpretive or merely
    ‘represents the agency’s view of the statute’s legal meaning and effect,’ the agency’s
    ‘interpretation of the meaning and legal effect of a statute is entitled to consideration and
    respect,’ ‘but commands a commensurably lesser degree of judicial deference.’
    [Citation.] [¶ ] Although the classification of an agency’s action as quasi-legislative or
    interpretive often guides our analysis, we have observed that ‘some rules defy easy
    categorization.’ [Citation.] … [I]n certain circumstances, a regulation may have both
    quasi-legislative and interpretive characteristics – “as when an administrative agency
    exercises a legislatively delegated power to interpret key statutory terms.” ’ ”
    (Christensen v. Lightbourne (2019) 
    7 Cal.5th 761
    , 771-772.)
    Here, DOJ was directed to implement a registration program within the purposes
    of section 30900, subdivision (b)(1) to (b)(4). Such a directive clearly gave to DOJ a
    quasi-legislative authority to accomplish that purpose. Thus, the scope of our review is
    17
    limited to determining whether the challenged regulations are (1) within the scope of the
    authority conferred and (2) is reasonably necessary to effectuate the purpose of the
    statute. (Christensen v. Lightbourne, supra, 7 Cal.5th at p. 771.) Where the Legislature
    has, as here, delegated to an agency the responsibility to implement a statutory scheme
    through regulations, a reviewing court will not interfere unless “the agency has clearly
    overstepped its statutory authority or violated a constitutional mandate.” (Ford Dealers
    Assn. v. Department of Motor Vehicles (1982) 
    32 Cal.3d 347
    , 355-356, italics added.)
    “ ‘ “ ‘The scope of our review of an administrative agency’s regulations is limited: we
    consider whether the challenged provisions are consistent and not in conflict with the
    enabling statute and reasonably necessary to effectuate its purpose.’ ” ’ ” (Masonite
    Corp. v. County of Mendocino Air Quality Management Dist. (1996) 
    42 Cal.App.4th 436
    ,
    447, italics added.)
    In undertaking this review, we also keep in mind that the regulations under
    consideration need not simply mirror the statutory language, but may fill in details to
    further the purpose of the governing legislation: “ ‘ “ ‘In enacting such rules and
    regulations, the Board is empowered to fill up the details of the enabling legislation.
    [Citation.] The court’s role is to decide whether in enacting the specific rule the [agency]
    reasonably interpreted the legislative mandate.’ ” ’ ” (Masonite Corp. v. County of
    Mendocino Air Quality Management Dist., supra, 42 Cal.App.4th at p. 447.) ‘“An
    administrative agency is not limited to the exact provisions of a statute in adopting
    regulations to enforce its mandate. “[The] absence of any specific [statutory] provisions
    regarding the regulation of [an issue] does not mean that such a regulation exceeds
    statutory authority .…’ [Citations.] The [administrative agency] is authorized to “ ‘fill
    up the details’ ” of the statutory scheme.’ ” (PaintCare v. Mortensen (2015) 
    233 Cal.App.4th 1292
    , 1307; accord, Batt v. City and County of San Francisco (2010) 
    184 Cal.App.4th 163
    , 171.) Similarly, the agency’s authority also includes the power to
    elaborate the meaning of statutory terms. (GMRI, Inc. v. California Dept. of Tax & Fee
    18
    Administration (2018) 
    21 Cal.App.5th 111
    , 125.) It is also a well-settled principle of
    administrative law that in the absence of an express statutory directive to the contrary, an
    agency may exercise its discretion in selecting the methodology by which it will
    implement the authority granted to it. (Community Water Coalition v. Santa Cruz County
    Local Agency Formation Com. (2011) 
    200 Cal.App.4th 1317
    , 1328.)
    In determining whether an agency has incorrectly interpreted the statute it purports
    to implement, a court generally gives weight to the agency’s construction. (Western
    States Petroleum Assn. v. Board of Equalization (2013) 
    57 Cal.4th 401
    , 415.)
    “ ‘Nevertheless, the proper interpretation of a statute is ultimately the court’s
    responsibility.’ ” (Id. at pp. 415-416.) “‘When a regulation is challenged on the ground
    that it is not “reasonably necessary to effectuate the purpose of the statute,” our inquiry is
    confined to whether the rule is arbitrary, capricious, or without rational basis [citation]
    and whether substantial evidence supports the agency’s determination that the rule is
    reasonably necessary [citation].’ [Citation.] The question of ‘reasonable necessity’
    generally implicates the agency’s expertise; therefore it receives a much more deferential
    standard of review.” (Delta Stewardship Council Cases (2020) 
    48 Cal.App.5th 1014
    ,
    1048.)
    The party challenging a regulation has the burden to show its invalidity. (Delta
    Stewardship Council Cases, supra, 48 Cal.App.5th at p. 1049.)
    C. The Regulations Were Reasonably Necessary to Accomplish Statutory
    Mandate
    The trial court concluded the regulations were reasonably necessary to the
    accomplishment of the statutory purpose of creating an effective registration process for
    bullet-button assault weapons, and the regulations were also reasonably within DOJ’s
    authority to fill in the details of the legislation. Accordingly, the trial court concluded
    that plaintiffs had failed to show DOJ exceeded the scope of the APA exemption. As the
    trial court expressed in its order: “DOJ is authorized to ‘adopt regulations for the purpose
    19
    of implementing’ the authorizing statute. [Citation.] The regulations at issue here each
    appear to do just that, such that the APA exemption would apply. The challenged
    regulations ensure that eligible weapons are registered, by eligible applicants, through an
    understandable registration process.”
    Based on our independent review, we conclude the trial court was correct. As we
    have noted hereinabove, section 30900, subdivision (b)(5), delegated quasi-legislative
    power to DOJ to create a registration program for bullet-button assault weapons. In
    doing so, DOJ was not limited by the specific language of section 30900, subdivision (b),
    but could appropriately fill in the details of what was reasonably needed to accomplish an
    effective registration program. As more fully discussed below, that appears to be
    precisely what DOJ did in adopting the regulations at issue in this appeal. Further,
    plaintiffs have failed to meet their burden of demonstrating the invalidity of any of the
    regulations.
    Below, we consider plaintiffs’ main arguments raised as to specific aspects of the
    registration regulations.
    1. The Breadth of the Regulations
    Plaintiffs generally object that the registration regulations “concern themselves not
    [merely] with how to register ‘bullet-button assault weapons,’ but instead with what may
    be registered, who may register, or the conditions for registration.” But plaintiffs, whose
    burden it is to affirmatively demonstrate the regulations’ invalidity (Delta Stewardship
    Council Cases, supra, 48 Cal.App.5th at p. 1049), offer no adequate explanation why
    regulations implementing an effective registration process should not address these key
    topics. Moreover, as DOJ has cogently explained, implementing an effective bullet-
    button assault weapon registration program reasonably required addressing several
    interrelated matters: “To administer the registration process, DOJ found it necessary to
    promulgate regulations that make it possible to: determine the types of firearms that can
    be registered (registration definitions); register weapons that the Legislature has required
    20
    to be registered (registration of bullet-button [assault weapons]); obtain information
    necessary to uniquely identify each registered weapon (serial number and digital photo
    requirements) or confirm an applicant’s eligibility to register a firearm (registration
    information requirements); prevent abuse of the joint registration option (‘family
    member’ definition and proof-of-address requirements); establish parameters for the
    electronic registration process required by law (terms of use); and prohibit subsequent
    modification of registered weapons into weapons that first became prohibited almost
    twenty years ago, and have been unlawful to acquire since then (modification
    prohibition).… [T]hese regulations ensure that only eligible weapons are registered, only
    by eligible applicants, through a transparent, reliable process.”
    We find DOJ’s explanation to be persuasive. The topics covered by the
    regulations may be broad, but they are interrelated and reasonably impact whether the
    registration system implemented by DOJ will be understandable, reliable and effective.
    Further, DOJ is within its discretion to fill in such details to accomplish the legislative
    purpose. (See PaintCare v. Mortensen, supra, 233 Cal.App.4th at p. 1307.) We
    conclude the registration regulations at issue herein were within the scope of the authority
    conferred and reasonably necessary to effectuate the statutory purpose. (See Christensen
    v. Lightbourne, supra, 7 Cal.5th at p. 771.) Additionally, we note “the question of
    ‘reasonable necessity’ generally implicates the agency’s expertise; therefore it receives a
    much more deferential standard of review.” (Delta Stewardship Council Cases, supra,
    48 Cal.App.5th at p. 1048.) For all these reasons, we reject plaintiffs’ argument that the
    breadth of the topics covered in the regulations means they were outside the bounds of
    the APA exception set forth in section 30900, subdivision (b)(5).
    2. Inclusion of Bullet-Button Shotguns
    We have already addressed in this opinion, plaintiffs’ contention that the
    regulations impermissibly included the registration of bullet-button shotguns because, as
    was noted by plaintiffs, Senate Bill 880 only amended the definition of assault weapons
    21
    to include bullet-button rifles and pistols. As we concluded hereinabove, the question has
    been rendered moot by subsequent statutory amendment. That is, under a 2020
    amendment revising subdivision (a)(7) of section 30515, AWCA now includes bullet-
    button semi-automatic shotguns in the definition of assault weapons. (§ 30515, subd.
    (a)(7) [an assault weapon includes “a semiautomatic shotgun that does not have a fixed
    magazine”]; Stats. 2020, ch. 29, § 38.) As previously explained, due to this issue
    becoming moot, we decline to reach it.
    3. Consolidation of Definitions Related to Bullet-Button Registration
    Process
    Plaintiffs challenge the validity of the definitional provisions contained in the
    registration regulations (see Cal. Code Regs., tit. 11, § 5471) as going beyond the scope
    of the APA exemption. Plaintiffs’ argue that DOJ, in adopting the subject regulations,
    repealed five valid definitions in former section 5469 of the California Code of
    Regulation that had been applicable to the identification of assault weapons – which
    repeal would have required APA compliance. However, as correctly pointed out by DOJ,
    plaintiffs’ argument fails because the subject definitional provisions were not repealed,
    but simply consolidated to a new location. (See former Cal. Code Regs., tit. 11, § 5469
    [former site of five definitions for purposes of § 30515]; cf. Cal. Code Regs., tit. 11,
    §§ 5469, 5471 [new location of definitional provisions].) Two of the subject definitions
    (i.e., “forward pistol grip” and “thumbhole stock”) were moved to section 5471 of the
    regulations without change. (Cal. Code Regs., tit. 11, § 5471, subds. (t), (qq).) The
    remaining three (i.e., “ ‘detachable magazine,’ ” “ ‘flash suppressor,’ ” and “ ‘pistol grip
    that protrudes conspicuously beneath the action of the weapon’ ”) were moved to
    California Code of Regulations section 5471 of the regulations without substantial
    change, with specific qualifying examples added. (Cal. Code Regs., tit. 11, § 5471,
    subds. (m), (r), (z).) Certainly, it would be within DOJ’s reasonable discretion in
    establishing an effective registration program to have definitions consolidated in one
    22
    place – i.e., a single section of the regulations containing the registration definitions -- to
    reduce confusion during the registration process. In any event, no actual repeal or
    deletion has been shown. Based on the foregoing, we reject plaintiffs’ contention that
    certain definitions were improperly repealed or deleted under the registration regulations.
    Plaintiffs’ second argument challenging the definitional provisions of the
    registration regulations (see Cal. Code Regs., tit. 11, § 5471) is that some of the terms
    defined therein are not specifically related to the registration of bullet-button assault
    weapons. Based on that premise, plaintiffs argue the definitional provisions exceeded the
    APA exemption, and thus APA procedures had to be followed. We disagree. As DOJ
    persuasively maintains, the subject definitions are relevant to the registration process by
    helping clarify and summarize much of the technical statutory terminology referred to in
    section 30515 for purposes of implementing the registration requirement of section
    30900, subdivision (b). Among other things, setting forth such definitions would appear
    to be reasonably necessary for the public to readily understand what types of weapons
    would constitute a bullet-button assault weapon, and what types of weapons would not,
    under the various technical terms.10
    As the trial court correctly observed, “[t]he APA exemption granted by the
    Legislature would appear to include the power to define terms to enable the public to
    understand and comply with the registration process.” Additionally, DOJ’s assessment of
    10      We note the majority of the definitions provided in section 5471 of the California
    Code of Regulations are clearly relevant to the registration process by either (1)
    summarizing and clarifying various basic or technical terminology used to define and
    differentiate types of assault weapons, and/or by (2) specifically defining essential terms
    for whether a particular weapon has the features or attributes that would make it a bullet-
    button assault weapon for purposes of the registration requirement. (See, e.g., Cal. Code
    Regs., tit. 11, §§ 5471, subds. (a), (b), (c), (e), (f), (j), (m), (n), (p), (q), (r), (t), (v), (y),
    (z), (ee), (gg), (hh), (ll), (nn), (pp), (qq), (rr); compare, 30515, subd. (a)(1), (a)(4) &
    (a)(7).) Other definitional provisions appear to be indirectly relevant to the process of
    registration, such as by identifying unique features that may need to be reported when
    registering (e.g., Cal. Code Regs., tit. 11, § 5471, subds. (d) & (x) [re: barrel length]).
    23
    what definitional provisions would be reasonably necessary to facilitate the statutory
    purpose of implementing an effective registration program under section 30900,
    subdivision (b), as well as to reasonably fill-in the details thereof, were matters within its
    considerable agency expertise to which deference is appropriate. (See Yamaha Corp. of
    America v. State Bd. of Equalization, supra, 19 Cal.4th at pp. 11-12.) For all the
    foregoing reasons, we conclude that the definitional provisions adopted by DOJ in the
    registration regulations (i.e., Cal. Code of Regs., tit. 11, § 5471) were within the scope of
    the statutory authority conferred upon DOJ by section 30900, subdivision (b)(5) and were
    reasonably necessary to effectuate the purpose of the statute. Accordingly, the definitions
    did not exceed the scope of the APA exemption.
    We note further that, according to DOJ, plaintiffs’ argument the requirements of
    the APA had to be followed as to the definitional provisions has arguably been rendered
    moot because of subsequent regulatory action. That is, in January 2019, a separate
    regulation promulgated by DOJ under the APA’s procedural requirements became
    effective, which regulation incorporates by reference each of the definitions set out in
    section 5471 of the registration regulations. This separate regulation, codified as section
    5460 of title 11, California Code of Regulations, provides as follows: “The definitions of
    terms in section 5471 of this chapter shall apply to the identification of assault weapons
    pursuant to Penal Code section 30515.” (Cal. Code Regs., tit. 11, § 5460.) By and
    through the adoption of this separate regulation which incorporates by reference the
    definitions at issue, the subject definitional provisions have apparently been vetted
    through the APA procedures, which arguably renders plaintiffs’ challenge thereof moot.
    DOJ argues we should so hold. However, we do not rely on mootness in rejecting
    plaintiffs’ APA-based challenge of the definitional provisions, primarily because APA
    compliance as to the separate regulation (i.e., Cal. Code Regs., tit. 11, § 5460) has not
    been adequately developed by citation to the record or judicially noticeable facts.
    24
    4. The Serial Number Requirement
    Plaintiffs challenge the requirement of serial numbers in connection with the
    registration of bullet-button assault weapons manufactured by an unlicensed subject (also
    referred to as FMBUS or home-built firearms), which serial number would be assigned
    by DOJ prior to the home-built weapon’s registration. (Cal. Code Regs., tit. 11, §§ 5472,
    subds. (f) & (g); 5474.2.) Plaintiffs contend this requirement goes beyond the scope of
    the governing statute and exceeds DOJ’s regulatory discretion. We disagree. Section
    30900, subdivision (b)(3) expressly requires that the registration of an assault weapon
    include descriptive information necessary to identify it uniquely. In carrying out that
    mandate, it was within DOJ’s reasonable authority to require such home-built assault
    weapons have an assigned serial number. As explained by DOJ: “DOJ-issued serial
    numbers for registered homebuilt weapons will allow law enforcement to positively
    identify such weapons if they are encountered in the field, are used in a crime, or need to
    be confiscated from persons prohibited from possessing firearms. Owner-selected serial
    numbers (e.g., the initials of the person who built the weapon and the date it was built)
    would not ensure a unique identifier, because unlike serial numbers applied by federally
    licensed manufacturers, another owner may assign another weapon the same identifier.”
    These concerns specifically relating to the need for more adequate and stable
    identification of home-built weapons reflects that the challenged regulations were
    reasonably necessary.
    We conclude plaintiffs’ challenge of the serial-number requirement for home-built
    assault weapons fails. Moreover, because the subject regulations were proper when
    adopted, which is a sufficient basis to reject plaintiffs’ challenge, we need not consider
    whether subsequent legislation (i.e., § 29180, subd. (b) [serial number requirement])
    taking effect after the registration deadline may have potentially supplanted these
    particular regulations.
    25
    5. The Non-Liability Clause
    Plaintiffs challenge former regulation section 5473, which had included a
    provision limiting DOJ’s liability with respect to posting of information electronically.
    The subject regulation has subsequently been repealed (former Cal. Code Regs., tit. 11,
    § 5473). Therefore, any challenge thereof has been rendered moot and we do not address
    plaintiffs’ contention.
    6. Required Registration Information
    Plaintiffs argue that some of the personal information required for registration by
    California Code of Regulations, title 11, section 5474, subdivision (a), was improper
    because it went beyond the core information stated by section 30900, subdivision (b)(3).
    Section 30900, subdivision (b)(3), provides that registrants must provide among other
    information their “full name, address, telephone number, date of birth, sex, height,
    weight, eye color, hair color, and California driver’s license number or California
    identification card number.” The challenged regulation requires further information such
    as military identification number (if applicable), place of birth, country of citizenship,
    and alien registration number or I-94, if applicable. (Cal. Code Regs, tit. 11, § 5474.)
    We reject plaintiffs’ argument because there is no merit to the assumption that the
    regulations must only repeat the authorizing statute. (PaintCare v. Mortensen, supra, 233
    Cal.App.4th at p. 1307; accord, Batt v. City and County of San Francisco, supra, 184
    Cal.App.4th at p. 171.) Rather, as we have noted, an administrative agency is authorized
    to fill up the details of the statutory scheme, in order to accomplish the statutory purpose.
    (PaintCare v. Mortensen, supra, p. 1307.) Integral to an effective registration process,
    DOJ must be able to confirm that applicants are not prohibited by state or federal law
    from possessing a firearm, prior to registration. (§ 30950.) The additional information
    requested in the regulation was clearly relevant to that purpose. (See 
    18 U.S.C. § 922
    ,
    subd. (g).)
    26
    Plaintiffs also challenge the requirement for “clear digital photos” (Cal. Code
    Regs., tit. 11, § 5474, subd. (c)) based on the statute’s reference to providing a
    “description” rather than a literal “depiction” of the firearm (see § 30900, subd. (b)(3)).
    But, as we have emphasized, “ ‘[a]n administrative agency is not limited to the exact
    provisions of a statute in adopting regulations to enforce its mandate.” (Paintcare v.
    Mortensen, supra, 233 Cal.App.4th at p. 1307.) Clear digital photographs would
    reasonably assist in uniquely identifying the weapon, as required by statute, and would
    also allow DOJ to confirm that the weapon was accurately described in the application
    and is eligible for registration (e.g., whether it has a bullet button).
    We conclude the informational requirements set forth in this regulation were
    consistent with the statutory purpose and reasonably necessary to implement an effective
    registration process.
    7. Joint Registration Requirements
    One of the registration regulations adopted by DOJ addressed the qualifications
    for a joint registration by family members in the same household. (Cal. Code Regs., tit.
    11, § 5474.1, subd. (b).) The regulation stated that joint registrants must have one of the
    following family relationships: “(1) Spouses [¶ ] (2) Parent to Child [¶ ] (3) Child to
    Parent [¶ ] (4) Grandparent to Grandchild [¶ ] (5) Grandchild to Grandparent [¶ ] (6)
    Domestic Partners [¶ ] (7) Siblings.” (Id.) In challenging this regulation, plaintiffs argue
    that another statute, i.e., section 30955, provides for joint registration of assault weapons
    “owned by family members residing in the same household.” According to plaintiffs,
    since section 30955 does not limit the nature of the family relationships that may qualify,
    it was improper for DOJ to do so here, or at least it could not do so within the scope of
    the APA exemption -- i.e., APA procedures had to be followed. DOJ responds that its
    regulation specifying the family relationships that qualify for joint registration of bullet-
    button assault weapons was within its quasi-legislative authority to implement the
    27
    registration process concerning such weapons, as a means of preventing the joint
    registration option from being misused.
    We agree with DOJ that the adoption of regulations to implement an effective
    registration process for bullet-button assault weapons may reasonably include the
    adoption of measures to prevent abuses of that process. Furthermore, section 30955,
    subdivision (a), states in full: “The department’s registration procedures shall provide
    the option of joint registration for any assault weapon… owned by family members
    residing in the same household.” (Italics added.) Since DOJ was mandated under the
    terms of section 30900, subdivision (b)(5), to implement registration procedures for
    bullet-button assault weapons, the issue of joint registration was appropriately
    considered. It was also within DOJ’s agency expertise to have recognized that aspects of
    joint registration may be subject to misuse. On balance, we conclude that the regulation
    supplying a reasonable interpretation of “family members” for purposes of determining
    how to administer the joint registration of bullet-button assault weapons was properly
    within the purview of DOJ’s quasi-legislative authority conferred in this case, and came
    within the APA exemption. (See, e.g., Association of California Ins. Companies v. Jones
    (2017) 
    2 Cal.5th 376
    , 399 [the Legislature may grant an administrative agency broad
    authority to apply its expertise in determining whether and how to address a matter
    requiring regulation].)
    8. Prohibition on Modification of the Registered Weapons
    California Code of Regulations, title 11, section 5477 states that “[t]he release
    mechanism for an ammunition feeding device on an assault weapon registered pursuant
    to Penal Code section 30900, subdivision (b)(1) shall not be changed after the assault
    weapon is registered.” In short, this regulation prevents a bullet-button assault weapon
    from being converted into a weapon that was prohibited and could not have been lawfully
    registered under Senate Bill 880, such as by the removal of the bullet-button mechanism
    to create a quick-release assault weapon. We reject plaintiffs’ challenge of this
    28
    regulation. As persuasively argued by DOJ: “It cannot be that the Legislature intended
    to allow the bullet-button assault weapon registration process to be used as a means of
    manufacturing previously prohibited assault weapons. DOJ’s authority to implement the
    registration process necessarily includes authority for regulations securing the registration
    process against this type of abuse, which would undermine assault weapons restrictions
    that have been on the books for decades. The regulation is thus related to and reasonably
    necessary for the registration process.” We agree with DOJ’s argument and conclude this
    regulation was within DOJ’s statutory authority and reasonably necessary to effectuate
    the purpose of the law.
    V.     Any Error in Demurrer Ruling Was Not Prejudicial
    Plaintiffs argue the trial court erred by sustaining DOJ’s demurrer on the ground
    that plaintiffs could only proceed by traditional mandamus, rather than declaratory relief.
    On this question, we note that it does appear our courts have allowed questions of APA
    compliance, including issues of whether exemptions or exceptions to the APA were
    applicable, to be addressed by claims for declaratory relief. (See, e.g., California School
    Bds. Assn. v. State Bd. of Education, supra, 186 Cal.App.4th at p. 1335 [APA questions
    raised in causes of action that included declaratory relief]; California Advocates for
    Nursing Home Reform v. Bonta (2003) 
    106 Cal.App.4th 498
    , 504 [APA questions
    presented by a complaint seeking declaratory and injunctive relief along with writ of
    mandate under Code Civ. Proc., § 1085]; see also, Morales v. California Dept. of
    Corrections & Rehabilitation, supra, 168 Cal.App.4th at p. 735 [holding APA applied to
    certain prison regulations, rejecting applicability of exception, and declaring regulations
    invalid for failure to comply with APA procedures].) Further, this would appear to be
    consistent with the general principle that where the nature of the action being challenged
    is quasi-legislative in character, such as an agency’s adoption of regulations, it is
    reviewable by traditional writ of mandate or by declaratory relief under section 1060 of
    the Code of Civil Procedure. (See, e.g., Pacific Legal Foundation v. California Coastal
    29
    Com., supra, 33 Cal.3d at pp. 168-169; Simi Valley Adventist Hosp. v. Bonita (2000) 
    81 Cal.App.4th 346
    , 354; see also, Gov. Code, § 11350, subd. (a) [expressly authorizing
    declaratory relief under APA].)11
    But even assuming the trial court erred in its demurrer ruling, we would conclude
    there was no prejudice. Our explanation of lack of prejudice requires some further
    elaboration of the procedural background, which we set forth below.
    As previously outlined hereinabove, plaintiffs’ original complaint included causes
    of action for declaratory relief seeking a judicial determination that the registration
    regulations, or provisions thereof, were invalid because, among other things, DOJ failed
    to comply with the APA’s procedural requirements. The complaint acknowledged the
    statutory exemption from the APA under section 30900, subdivision (b)(5), but alleged
    the exemption did not apply because the subject matter of the regulations exceeded the
    scope of the APA exemption and even impermissibly sought to alter or expand the terms
    of the governing statute. DOJ demurred to the complaint on the ground that the only
    proper vehicle for plaintiffs’ challenge was a petition for writ of mandate, rather than an
    action for declaratory relief. (See Tejon Real Estate, LLC v. City of Los Angeles (2014)
    
    223 Cal.App.4th 149
    , 155 [demurrer may be sustained where the complaint attempts to
    obtain review of an agency’s administrative decision via declaratory relief rather than
    mandamus].) In support of this ground for demurrer, DOJ argued plaintiffs were
    11     Government Code section 11350 of the APA specifically provides that “Any
    interested person may obtain a judicial declaration as to the validity of any regulation …
    by bringing an action for declaratory relief in the superior court in accordance with the
    Code of Civil Procedure.” (Gov. Code, § 11350, subd. (a).) However, section 11350 is
    not available where the regulations were within a statutory exemption to the APA.
    (Pacific Legal Foundation v. California Coastal Com., supra, 
    33 Cal.3d 158
     at p. 169, fn.
    4.) But here, the crux of the matter was the legal question of whether the regulations
    were within the scope of the APA exemption. In any event, we note plaintiffs did not
    rely exclusively on Government Code section 11350, but also sought declaratory relief
    under Code of Civil Procedure section 1060.
    30
    essentially challenging DOJ’s discretionary administrative decision that adopting the
    registration regulations did not require APA compliance but could be done through the
    expedited “file and print” process because the regulations came within the scope of the
    statutory exemption.
    Plaintiffs opposed the demurrer, arguing they were not seeking review of any
    administrative decision by DOJ, but were instead challenging the validity of the
    regulations themselves based on DOJ’s failure to comply with the APA and also based on
    allegations the regulations were inconsistent with or sought to alter or expand the
    AWCA.
    The trial court agreed with DOJ’s characterization of the challenged action as an
    administrative decision and, accordingly, sustained DOJ’s demurrer to the complaint with
    leave to amend. Plaintiffs filed a first amended complaint. In substance, the first
    amended complaint appears to have retained the declaratory relief causes of action intact,
    while adding separate claims for relief by writ of mandate.12 After the first amended
    complaint was filed, plaintiffs notified the parties of a hearing date to determine the
    merits of their claims for writ of mandate and declaratory relief. Following that hearing,
    the trial court issued its order denying all relief under the first amended complaint.
    Although the trial court’s order analyzed plaintiffs’ claims within the framework of writ
    of mandate, the trial court nonetheless addressed plaintiffs’ various legal challenges to
    the regulations and reached the following disposition: “[T]he petition [for] writ of
    mandate, and declaratory and injunctive relief, is denied.”
    Based on the above procedural history and our assessment of the trial court’s order
    denying all relief under the first amended complaint, we conclude that regardless of how
    the causes of action were formally denominated in the pleading, the substance of the
    12      Since plaintiffs did not amend the declaratory relief claims, it does not appear that
    plaintiffs waived the right to challenge the demurrer ruling as to those claims.
    31
    dispositive legal questions in this case were declared and decided, including the questions
    of whether DOJ failed to comply with the APA and whether the regulations came within
    the scope of the statutory exemption. We have likewise addressed those same legal
    questions in the present appeal. Here, as the trial court did, we have concluded that
    plaintiffs have failed to demonstrate the invalidity of the regulations, either under the
    APA or an alleged conflict with the AWCA. In summary, even assuming the trial court’s
    ruling on demurrer was incorrect, it has made no material difference to the outcome or
    resolution of the dispositive legal questions. For these reasons, we conclude that even if
    the trial court’s demurrer ruling was erroneous, any such error was not prejudicial and is
    not ground for reversal.13
    DISPOSITION
    The judgment of the trial court is affirmed. Defendants are entitled to an award of
    costs on appeal.
    SMITH, J.
    WE CONCUR:
    HILL, P.J.
    DE SANTOS, J.
    13     Also, inasmuch as we have upheld the validity of the regulations, there is no actual
    or present controversy. (See Canova v. Trustees of Imperial Irrigation Dist. Employee
    Pension Plan (2007) 
    150 Cal.App.4th 1487
    , 1497 [declaratory relief is appropriate only
    for actual present controversy, not to redress past wrongs].)
    32