Yes, AR-15s are legal in California, but only in a configuration that complies with the state’s assault weapon laws. A standard AR-15 with a detachable magazine and a pistol grip is classified as an illegal assault weapon. To own one lawfully today, you either strip the prohibited features off the rifle or lock the magazine in place so it cannot be removed without breaking the action open.
What Makes an AR-15 Illegal in California
California uses two definitions of “assault weapon.” Certain rifles are banned by name, including the Colt AR-15 series and close variants.1Justia. California Penal Code 30500-30530 – General Provisions The definition that catches most buyers is the feature test: any semi-automatic centerfire rifle with a detachable magazine becomes an assault weapon if it also has any one of the following features:2State of California Department of Justice. Assault Weapon Characteristics
- A pistol grip that protrudes noticeably below the action
- A thumbhole stock
- A folding or telescoping stock
- A flash suppressor
- A forward pistol grip
- A grenade or flare launcher
The trigger is the phrase “detachable magazine.” If the rifle has one, a single feature from that list makes the whole rifle an assault weapon. Break either half of that pairing and the rifle is legal.
The Two Legal Configurations
Two builds keep an AR-15 out of the assault weapon category. Each defeats one side of the test.
Featureless Build
A featureless AR-15 keeps the detachable magazine but drops every prohibited feature. In practice that means replacing the standard pistol grip with a fin grip or grip wrap that stops your thumb from wrapping around it, swapping any flash suppressor for a muzzle brake or compensator, using a fixed-length stock, and leaving off any forward vertical grip. You keep normal magazine changes. The ergonomics change, and many shooters find the fin grip awkward at first.
Muzzle brakes are legal because they redirect gas to reduce recoil rather than reducing visible flash. If a device also reduces flash from the shooter’s line of sight, it can be treated as a flash suppressor regardless of what the manufacturer calls it. Picking a device clearly marketed as a brake or compensator keeps you clear of that gray area.
Fixed-Magazine Build
A fixed-magazine AR-15 keeps the pistol grip and adjustable stock, but the magazine is locked in place and cannot be removed without partially disassembling the action. In practical terms, the upper and lower receivers have to separate before the magazine comes out. Devices like the AR MagLock accomplish this by requiring you to pop the rear takedown pin and hinge the upper open before releasing the magazine.
The trade-off is reload speed. You either load through the open ejection port with a stripper clip or break the action, swap the magazine, and reassemble. The magazine also has to hold no more than 10 rounds, because a semi-automatic centerfire rifle with a fixed magazine over 10 rounds is separately classified as an assault weapon.1Justia. California Penal Code 30500-30530 – General Provisions
Rimfire AR-15
The feature test applies only to semi-automatic centerfire rifles.2State of California Department of Justice. Assault Weapon Characteristics An AR-15 chambered in .22 LR can legally have a pistol grip, adjustable stock, and detachable magazine all at once. Several manufacturers make AR-15 platform rifles in .22 LR for the California market. The obvious limitation is caliber: .22 LR suits target shooting and small-game hunting, not the range of uses a centerfire AR-15 covers.
The 10-Round Magazine Cap
Whichever configuration you pick, California caps magazine capacity at 10 rounds. Anything holding more is a “large-capacity magazine.” Manufacturing, importing, selling, lending, or buying one is punishable by up to a year in county jail. Simple possession is an infraction with a $100-per-magazine fine, or a misdemeanor with up to a year in jail.3California Legislative Information. California Penal Code PEN 32310
Tubular .22 caliber magazines and lever-action tubular magazines are exempt. So are magazines permanently altered so they cannot hold more than 10 rounds.
Buying an AR-15 in California
The purchase side has its own set of hoops.
Age and ID
You must be at least 21 to buy a semi-automatic centerfire rifle in California, absent a valid law enforcement or military exemption.4State of California Department of Justice. Overview of Key California Firearms Laws You’ll need a California driver’s license or state ID, which the dealer swipes before delivery.5State of California Department of Justice. Frequently Asked Questions
Firearm Safety Certificate
You need a valid Firearm Safety Certificate before the transaction can start. That means passing a 30-question test on firearm safety and California gun laws with a score of at least 75%. The test costs $25.6State of California Department of Justice. Firearm Safety Certificate Frequently Asked Questions DOJ-certified instructors administer it, usually at gun shops.
Waiting Period and Background Check
Once the dealer submits the Dealer Record of Sale to the DOJ, a 10-day waiting period runs, measured in 24-hour periods from when the DROS is accepted and assigned a number.5State of California Department of Justice. Frequently Asked Questions The DOJ runs the background check during that window. You cannot take possession until the period expires and the check clears. The DROS fee is $31.19.7Legislative Analyst’s Office. The 2026-27 Budget: Department of Justice
Purchase Frequency
Starting April 1, 2026, California limits firearm purchases to no more than three within any 30-day period, cumulative across all firearm types. The prior rule capped handguns at one per 30 days and left rifles alone. The new rule covers everything.8California Department of Justice. Information Bulletin 2026-DLE-02 – New and Amended Firearms Laws
Building Your Own AR-15
You can build a firearm for personal use in California, but only after the DOJ issues a unique serial number for it. Applications go through the California Firearms Application Reporting System. Once the serial number is issued, you have 10 days to engrave or permanently mark it on the lower receiver.9State of California Department of Justice. Self-Manufactured or Self-Assembled Firearms
The engraving must be at least .003 inches deep and no smaller than 1/16 inch. You can do it yourself, hire a Type 07 FFL, or use an unlicensed party who is not a prohibited person, as long as you don’t leave the part unattended with them.10Cornell Law School. California Code of Regulations Title 11 Section 5520 – Procedures to Engrave or Permanently Place the Unique Serial Number on the Firearm or Firearm Precursor Part
Assembling a firearm without a DOJ serial number is a crime. For rifles, the penalty is up to six months in county jail, a fine up to $1,000, or both, and each unserialized firearm is a separate offense.11California Legislative Information. California Penal Code PEN 29180 New residents who already own a self-built firearm from another state have 60 days after arriving to apply.
A home-built AR-15 has to comply with all the same assault weapon rules. A garage build with a pistol grip and detachable magazine is just as illegal as a store-bought one in that configuration.
Registration Is Closed. Transfer and Inheritance Are Dead Ends.
California ran registration windows in the past, most recently for “bullet button” rifles with a deadline of June 30, 2018,12Cornell Law School. California Code of Regulations Title 11 Section 5472 – Registration of Assault Weapons Pursuant to Penal Code Section 30900(b)(1) plus a court-ordered reopening from January 13 to April 12, 2022, for people whose original attempts hit technical problems. All windows are now closed. No new assault weapons can be registered. If you currently possess a rifle that qualifies as an assault weapon and it is not registered, you are committing a crime. The remaining options are to convert it to a compliant configuration, remove it permanently from California, sell it to a licensed dealer with the appropriate permits, or surrender it to law enforcement.13State of California Department of Justice. Frequently Asked Questions
Even a lawfully registered assault weapon cannot be sold or given to a family member. Transfers are limited to certain California peace officers with written approval from their agency head, processed through a licensed dealer holding a Dangerous Weapons Permit.13State of California Department of Justice. Frequently Asked Questions
Inheritance is the same story. If a registered assault weapon passes to you by will or intestate succession, you have 90 days to do one of the following:13State of California Department of Justice. Frequently Asked Questions
- Render the rifle permanently inoperable
- Sell it to a licensed dealer holding a DOJ permit for assault weapons
- Obtain a DOJ permit to possess assault weapons yourself (rarely issued to private individuals)
- Lawfully remove the rifle from California
That is a practical reason to pick a compliant build over registration in the first place. A registered assault weapon is an asset that cannot be passed on.
Penalties
Possessing an unregistered assault weapon can bring up to a year in county jail or a state prison sentence. A first offense can be reduced to a $500 fine if you can show you lawfully possessed the rifle before it was classified as an assault weapon, have no prior convictions for certain offenses, and did not use the rifle harmfully.14California Legislative Information. California Penal Code PEN 30605 With registration closed, that exception is narrow.
Large-capacity magazine possession is an infraction with a $100 fine per magazine or a misdemeanor with up to a year in jail. Manufacturing, buying, or importing one carries up to a year in county jail or a state prison sentence.3California Legislative Information. California Penal Code PEN 32310 Building a firearm without a DOJ serial number can bring up to six months in jail and a $1,000 fine per rifle.11California Legislative Information. California Penal Code PEN 29180
Pending Court Challenges
California’s assault weapon ban is being challenged in Miller v. Bonta. A federal district court struck the ban down, and the case is now back on remand to the district court from the Ninth Circuit for further proceedings under the Supreme Court’s 2022 framework in New York State Rifle & Pistol Association v. Bruen. The large-capacity magazine ban is being challenged separately in Duncan v. Bonta, where the Ninth Circuit upheld the ban en banc in March 2025, and a petition for Supreme Court review was filed in August 2025. Until a final ruling enjoins enforcement, the current laws are in full effect, and buying or building a non-compliant AR-15 on the bet that these cases will succeed can produce felony charges.