SAN FRANCISCO, CA (December 29, 2023) – Today, Firearms Policy Coalition (FPC) announced the filing of a brief with the Ninth Circuit Court of Appeals in support of the parties challenging California’s ban on so-called “large capacity” magazines. The brief in Duncan v. Bonta can be viewed at

“Under the Supreme Court’s decision in New York State Rifle & Pistol Association, Inc. v. Bruen, Plaintiffs must prevail in their challenge to California’s bans on commonly possessed semiautomatic ammunition magazines,” argues the brief. “Bruen unequivocally reaffirmed what District of Columbia v. Heller taught: All instruments that constitute bearable arms are ‘arms’ within the plain text of the Second Amendment. That certainly includes the firearms that can be equipped with magazines banned by California.”

"As FPC's legal brief clearly explains, California’s magazine ban is entirely unconstitutional and must fail under the Supreme Court's binding precedents," said FPC President Brandon Combs. "Arms in common use for lawful purposes are protected and their possession and use cannot be banned, period."

FPC's brief was filed by attorneys David H. Thompson and Peter A. Patterson of Cooper & Kirk, PLLC.

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Firearms Policy Coalition (, a 501(c)4 nonprofit organization, exists to create a world of maximal human liberty, defend constitutional rights, advance individual liberty, and restore freedom. FPC’s efforts are focused on the Right to Keep and Bear Arms and adjacent issues including freedom of speech, due process, unlawful searches and seizures, separation of powers, asset forfeitures, privacy, encryption, and limited government. The FPC team are next-generation advocates working to achieve the Organization’s strategic objectives through litigation, research, scholarly publications, amicus briefing, legislative and regulatory action, grassroots activism, education, outreach, and other programs.

FPC Law ( is the nation’s first and largest public interest legal team focused on the Right to Keep and Bear Arms, and the leader in the Second Amendment litigation and research space.