Boland v. Bonta: Handgun Roster and Microstamping Challenge

Boland v. Bonta challenges two interrelated components of California's firearms regulatory framework: the Roster of Handguns Certified for Sale (the "handgun roster") and the former roster microstamping requirement ^[1].

Related Roster Litigation

Renna v. Bonta separately challenges California's Unsafe Handgun Act under the Second and Fourteenth Amendments. Its plaintiffs sought to enjoin the roster requirements.

The Handgun Roster

California law requires that all new handguns sold by dealers be listed on the DOJ's Roster of Handguns Certified for Sale. To be listed, a handgun must pass drop-safety and firing tests and meet certain design requirements. Roster listings expire after one year and must be renewed by the manufacturer ^[2].

The Microstamping Requirement

In 2007, California enacted a law requiring semiautomatic pistols not already on the roster to be equipped with "microstamping" technology, which engraves a microscopic code on cartridge casings when fired. On May 17, 2013, the DOJ certified that microstamping technology was available to more than one manufacturer unencumbered by patent restrictions. New semiautomatic handgun models have been added to the roster since 2013, including the Glock 43X CA on September 29, 2026. On October 15, 2026, the DOJ roster listed 1,003 handguns.

Constitutional Challenge and Preliminary Injunction

Plaintiffs argued that the roster and microstamping requirement, operating together, constitute an unconstitutional restriction on the right to keep and bear arms. Under the Bruen framework, they contended that there is no historical tradition supporting a government-curated list of approved firearms for purchase, nor any analog to a requirement that firearms incorporate non-existent technology.

In March 2023, Judge Cormac Carney granted a preliminary injunction against the microstamping requirement, the chamber load indicator (CLI) requirement, and the magazine disconnect mechanism (MDM) requirement ^[3]. Notably, the state did not seek to reverse the injunction against the microstamping requirement.

Effect of the Injunction: New Roster Additions

With the microstamping requirement enjoined (the Ninth Circuit subsequently stayed the injunction as to the CLI and MDM requirements, restoring them to enforceable status), some new handgun models have entered the California market for the first time in over a decade. Notable additions include the Biofire Smart Gun, select Sig Sauer P320 Legion variants, and Shadow Systems DR920 variants ^[4]. While the overall roster continues to shrink as manufacturers allow older certifications to lapse, the injunction has demonstrated its practical significance by enabling new-generation pistols to reach California buyers. Since July 1, 2026, however, roster listing no longer guarantees dealer availability, because AB 1127 (Penal Code Section 27595) bars dealers from selling semiautomatic machinegun-convertible pistols. The sixteen Glock Gen3 models still listed on the roster cannot be sold by dealers unless an exception in PC 27595(c) applies. Those exceptions include inventory delivered before January 1, 2026.

Case Pended to Duncan v. Bonta

On March 25, 2024, the Ninth Circuit vacated submission of Boland pending the en banc decision in Duncan v. Bonta. The eleven-judge en banc panel upheld the LCM ban in Duncan in a 7-4 decision on March 20, 2025. Miller v. Bonta remains before a separate three-judge panel, which vacated submission on July 1, 2026 pending the Supreme Court's resolution of Grant v. Higgins and Viramontes v. Cook County. The microstamping part of the preliminary injunction concerned a requirement that SB 452 removed from the roster effective January 1, 2024. The Ninth Circuit stayed the injunction as to the CLI and MDM requirements, which are once again enforceable.

DOJ Microstamping Viability Report (July 2025)

On July 18, 2025, the California DOJ published a Microstamping Technological Viability Report ^[5] concluding that microstamping technology is "technologically viable." The DOJ's Bureau of Forensic Services found that microstamped firing pins can regularly produce legible imprints on spent cartridge casings across various ammunition types without compromising firearm safety or function.

This report is significant to the Boland litigation because the state can now argue that microstamping is no longer a hypothetical or impossible technology. However, the Boland injunction remains in effect regardless of the DOJ report, and the constitutional question, whether requiring a specific technology as a condition of sale violates the Second Amendment, is distinct from the question of whether the technology works.

Separately, SB 452 created a standalone microstamping framework outside the roster. Under SB 452, if the DOJ determines that microstamping components are technologically viable, it must determine by July 1, 2027 whether components at commercially reasonable prices are available or microstamping-enabled firearms are readily available for purchase in California. If the DOJ makes that determination, dealers may not sell non-microstamping-enabled semiautomatic pistols beginning January 1, 2028, subject to statutory exceptions. Those exceptions include pistols manufactured or delivered to a dealer before January 1, 2028. This statutory framework would operate independently of the roster and could be subject to its own legal challenges.

Renna Amended Complaint

The Fourth Amended Complaint in Renna v. Bonta challenges California's bans on the sale of commonly used handguns under the Second Amendment ^[7]. On March 27, 2025, the Ninth Circuit ordered supplemental briefing on the impact of Duncan v. Bonta.

The roster now faces a parallel federal attack. On July 1, 2026, the Department of Justice filed United States v. California, No. 8:26-cv-01697 (C.D. Cal.), challenging both AB 1127's machinegun-convertible pistol dealer ban and the Unsafe Handgun Act roster. On July 9, 2026, the district court denied the federal government's request for a temporary restraining order without reaching the Second Amendment merits. On September 11, 2026, the district court heard the preliminary-injunction and dismissal motions and took them under submission.

What This Means for California Handgun Buyers

New handgun models remain subject to the CLI and MDM requirements because the injunction against those requirements is stayed pending appeal. SB 452 removed the microstamping requirement from the roster effective January 1, 2024. SB 452 also created a separate microstamping framework for future dealer sales, subject to statutory conditions.