The California Department of Justice Bureau of Firearms[1] publishes interpretive guidance to help firearms owners, dealers, and manufacturers navigate the complex assault weapon identification system. While this guidance does not carry the force of law in the way that the Penal Code and Title 11 regulations do, it reflects the DOJ's enforcement position and is relied upon by courts and law enforcement agencies throughout the state.
Assault Weapon Identification Flowcharts
The Bureau of Firearms maintains decision flowcharts[2] for the three categories of firearms subject to the characteristics test:
- Semiautomatic centerfire rifle flowchart: Guides users through the detachable vs. fixed magazine determination, then through each prohibited feature (pistol grip, thumbhole stock, folding/telescoping stock, grenade/flare launcher, flash suppressor, forward pistol grip)
- Semiautomatic centerfire pistol flowchart: Addresses magazine type and prohibited features including threaded barrel, second handgrip, barrel shroud, and magazine acceptance outside the pistol grip
- Semiautomatic shotgun flowchart: Covers folding/telescoping stock, pistol grip, detachable magazine, and fixed magazine capacity
Fixed Magazine Guidance
Following the reclassification of the Bullet Button in 2017, the DOJ published guidance on what constitutes a "fixed magazine" under the current definition at Penal Code Section 30515(b). The DOJ's position is that a magazine is "fixed" only if it cannot be removed without disassembly of the firearm action.[3] Devices that require separation of the upper and lower receivers of an AR-platform rifle to release the magazine generally satisfy this definition. The DOJ has not published an exhaustive list of approved fixed-magazine devices, leaving manufacturers and owners to determine compliance based on the statutory definition and regulatory interpretation.
Featureless Build Guidance
The Bureau provides informal guidance on what constitutes a "featureless" rifle configuration. A featureless build removes all prohibited features so that the firearm can retain a standard detachable magazine. Common modifications include:
- Replacing a pistol grip with a fin grip, Thordsen FRS-15 stock, or similar device that eliminates the conspicuous protrusion beneath the action
- Pinning or welding a telescoping stock in the fixed position
- Replacing a flash suppressor with a muzzle brake or compensator (which is not a prohibited feature)
- Removing any forward vertical grip
Registration Guidance
The DOJ maintains an online assault weapon registration system and publishes guidance for owners of formerly Bullet Button-equipped firearms who were required to register by June 30, 2018. The registration guidance includes instructions for submitting photographs demonstrating the firearm's features and configuration.
Limitations of DOJ Guidance
DOJ guidance is interpretive and advisory. Courts are not bound by the DOJ's interpretation of the Penal Code, and the DOJ can change its position without formal rulemaking. In Miller v. Bonta[4], the ongoing Second Amendment challenge to California's entire assault weapons framework, the DOJ's regulatory interpretations have been both cited and questioned by the parties and the court. Firearms owners should not rely solely on DOJ guidance without understanding the underlying statutory and regulatory text.