The lawsuit challenging California’s handgun roster, Boland v. Bonta, is pending before the Ninth Circuit after a March 2023 district court injunction blocked the roster’s microstamping requirement and opened the approved list to new semiautomatic pistols for the first time in nearly a decade. The appeal is now fully briefed and awaiting a decision that will be shaped by two rulings issued after the injunction: the Supreme Court’s 2024 decision in United States v. Rahimi and the Ninth Circuit’s 2025 en banc decision in Duncan v. Bonta, both of which give California more room to defend the roster than it had when the case was first decided.
What the Roster Requires
Since 2001, California has barred the commercial sale of any handgun not certified by the state Department of Justice and placed on an approved roster. Certification requires passing a firing test and a drop-safety test.1State of California – Department of Justice – Office of the Attorney General. Handguns Certified for Sale Selling an off-roster handgun can bring up to a year in county jail, and unlawful sales through exemptions can carry civil penalties of up to $10,000.2California Legislative Information. California Penal Code 32000
Three additional requirements apply to new semiautomatic pistols and sit at the center of the lawsuit:
- A chamber load indicator, a visual or tactile signal that a round is in the chamber.
- A magazine disconnect mechanism, which prevents firing when the magazine is removed.
- Microstamping, added in 2013, which requires the firearm to engrave microscopic identifying characters on each fired cartridge case.
The chamber load indicator and magazine disconnect requirements took effect for new semiautomatic models introduced after January 2007.1State of California – Department of Justice – Office of the Attorney General. Handguns Certified for Sale The microstamping mandate had a different effect: no manufacturer in the world has produced a commercially available handgun with that capability, and no new semiautomatic pistol was added to the roster from 2013 until the district court blocked the requirement in 2023.3FindLaw. Boland v. Bonta – Preliminary Injunction Order
The roster does not apply to every transaction. Private party transfers, curio and relic firearms, certain single-action revolvers, and law enforcement purchases are exempt, and officers can later resell off-roster handguns through licensed dealers.4State of California – Department of Justice – Office of the Attorney General. State Exemptions for Authorized Peace Officers That resale channel has created a premium secondary market for models a typical buyer cannot otherwise obtain.
The Boland Ruling and the Partial Stay
Individual gun owners and the California Rifle and Pistol Association filed Boland v. Bonta arguing that all three technology requirements violate the Second Amendment because none has a historical analogue in the American tradition of firearms regulation.3FindLaw. Boland v. Bonta – Preliminary Injunction Order
On March 20, 2023, Judge Cormac Carney of the Central District of California granted a preliminary injunction blocking all three requirements. The court found that buying common handguns for self-defense falls within the Second Amendment’s text and that the state had not identified historical regulations comparable to these modern design mandates.5CourtListener. Lance Boland v. Rob Bonta
California appealed and asked the Ninth Circuit to keep the roster requirements in place during the appeal. On March 31, 2023, the Ninth Circuit partially granted that request. It stayed the injunction as to the chamber load indicator and magazine disconnect requirements, restoring them for the duration of the appeal. It left the microstamping injunction in place.5CourtListener. Lance Boland v. Rob Bonta
The result on the ground has been substantial. With microstamping out of the way, new semiautomatic handguns have been flowing onto the roster. In early 2026 alone, the state certified Smith and Wesson M&P pistols, Heckler and Koch VP9 variants, and several Desert Eagle configurations, all of which still had to satisfy the chamber load indicator and magazine disconnect rules.6State of California – Department of Justice – Office of the Attorney General. Recently Added Handgun Models
How Rahimi and Duncan Changed the Ground
The district court decided Boland using the framework the Supreme Court laid out in New York State Rifle and Pistol Association v. Bruen, which requires the government to defend a gun regulation by pointing to a historical tradition of comparable laws.7Supreme Court of the United States. New York State Rifle and Pistol Association, Inc. v. Bruen Two decisions since have made that burden easier to meet.
In June 2024, the Supreme Court decided United States v. Rahimi, upholding a federal law that disarms people subject to domestic violence restraining orders. The Court clarified that a historical analog does not need to be a “dead ringer” or “historical twin” of the modern law. It only needs to be “relevantly similar” in why and how it burdens the right to bear arms.8Supreme Court of the United States. United States v. Rahimi That lets California argue at a higher level of generality, pointing to a broader tradition of restricting dangerous weapons or attaching safety-related conditions to arms rather than producing a specific founding-era match for microstamping.
Then in March 2025, an 11-judge en banc panel of the Ninth Circuit decided Duncan v. Bonta, upholding California’s ban on large-capacity magazines. The court held that large-capacity magazines are accessories rather than “Arms” protected by the Second Amendment’s text, and that even if the Amendment applied, the ban fits the historical tradition of restricting especially dangerous weapon features.9United States Courts. Duncan v. Bonta (9th Cir. 2025)
Duncan cuts in both directions for the roster. The state will argue that if it can ban a magazine feature outright, it can certainly condition handgun sales on safety features. Plaintiffs will argue that Duncan concerned an accessory, while the roster restricts the sale of common handguns themselves when manufacturers cannot comply with the design mandates.
Where the Appeal Stands
One week after Duncan came down, the Ninth Circuit panel assigned to Boland ordered supplemental briefing on how the en banc decision affects the case and whether it should be sent back to the district court. Plaintiffs filed on April 17, 2025, and the state responded on May 1, 2025.5CourtListener. Lance Boland v. Rob Bonta As of mid-2025, the case is fully briefed before Judges Berzon, Rawlinson, and Bress. No oral argument has been scheduled.
The remand question matters. The district court ruled in March 2023, before Rahimi loosened Bruen‘s historical-analogue demand and before Duncan laid out how the Ninth Circuit reads that tradition. Sending the case back would give the district court a fresh look under a framework more favorable to the state. Keeping it at the Ninth Circuit could produce a faster answer.
SB 452 and California’s Microstamping Backup
California is not waiting for the courts to sort out microstamping. In 2023, the governor signed Senate Bill 452, which shifts the burden of producing the technology away from firearm manufacturers and onto the state.
The timeline works in stages. By January 1, 2026, the Department of Justice was required to begin accepting applications from entities that make microstamping components meeting state performance standards. By July 1, 2026, the DOJ is supposed to provide grants or contracts to licensed component producers so the parts become available at reasonable cost to manufacturers, dealers, and gunsmiths. Enforcement kicks in on January 1, 2028, when licensed dealers must verify that any semiautomatic pistol they sell is certified as “microstamping-enabled.”10California Department of Justice. Determination Regarding the Technological Viability of Microstamping Components
The approach targets a central weakness of the original mandate, which was that no commercially available microstamping technology existed at any price. If California can show the components are viable and accessible, the factual record in any future legal challenge changes. SB 452 could itself face a Second Amendment challenge, but its existence signals the state intends to keep microstamping alive regardless of how Boland ends.
What Each Outcome Would Mean
If the Ninth Circuit strikes down the technology mandates, manufacturers could seek certification for current-production models without microstamping, chamber load indicators, or magazine disconnects. The roster would likely expand quickly, and the law enforcement resale market that currently commands large premiums on off-roster handguns would shrink as those same models became available through ordinary retail.
If the court upholds the roster in full, the chamber load indicator and magazine disconnect requirements would remain as they have throughout the appeal. The real shift would be the dissolution of the microstamping injunction. Before SB 452’s 2028 framework takes effect, that could refreeze new semiautomatic additions to the roster, since compliant technology does not yet exist commercially. After 2028, the DOJ’s component-supply program could soften the transition if it works as designed.
A remand would mean more delay but a fresh evidentiary record, one that could include the DOJ’s own microstamping viability findings, the handguns added to the roster since 2023, and whatever the technology looks like by the time the district court rules again. Any final resolution is likely still years away.