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 microstamping requirement that has effectively frozen it ^[1].

Update: NRA Intervention (March 27, 2026)

On March 27, 2026, the National Rifle Association filed a motion to intervene in Boland v. Bonta, joining the lawsuit via a Fourth Amended Complaint. The NRA's participation adds institutional resources and a broader constituency to the challenge against California's handgun roster and microstamping requirements, though the core legal theories remain those advanced by the original plaintiffs.

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 all new semiautomatic pistols to be equipped with "microstamping" technology, which engraves a microscopic code on cartridge casings when fired. The requirement was certified as technologically available in 2013. Since no manufacturer has implemented the technology, no new semiautomatic handgun models have been added to the roster since 2013. The roster has steadily shrunk from over 1,200 models at its peak to approximately 950 as manufacturers discontinue older models or allow certifications to lapse.

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 (certified February 2025), 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.

Case Pended to Duncan v. Bonta

In 2025, Boland was vacated and pended to the Ninth Circuit's en banc resolution of Duncan v. Bonta. The eleven-judge en banc panel that decided Duncan (upholding the LCM ban in a 7-4 decision on March 20, 2025) is expected to address Miller v. Bonta (assault weapons) and then Boland as part of a coordinated review of California's firearms regulatory framework. The preliminary injunction against the microstamping requirement remains in effect during this period. 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 confirms commercial availability by July 1, 2027, a restriction would prohibit dealers from selling any non-microstamped semiautomatic pistol on or after January 1, 2028. This statutory framework would operate independently of the roster and could be subject to its own legal challenges.

NRA Joins the Challenge (March 2026)

On March 27, 2026, plaintiffs filed a Fourth Amended Complaint adding the National Rifle Association as a plaintiff ^[7]. The complaint argues that California's prohibition on non-rostered handguns violates the Second and Fourteenth Amendments. The NRA's addition significantly escalates the legal resources and national visibility of the roster challenge. The case remains stayed at the Ninth Circuit pending resolution of Duncan v. Bonta.

What This Means for California Handgun Buyers

For now, the Boland injunction continues to allow new handgun models onto the roster without microstamping, CLI, or MDM requirements. Buyers benefit from an expanding selection of modern pistols. However, this access depends on the injunction remaining in effect. If the en banc panel dissolves the injunction after resolving Duncan, and if the SB 452 timeline proceeds, the window for adding non-microstamped pistols to the roster could close.