Can I Build an AR-15 in California?
Woody's answers are based on published federal and state law. Not legal advice. Consult a licensed attorney for your specific situation.
Yes, you can build an AR-15 in California, but it must comply with strict state assault weapon laws. The rifle must be featureless or use a fixed magazine system to remain legal.
What This Means for You
California allows AR-15 builds but heavily regulates their configuration through assault weapon restrictions. Your completed rifle must either have no prohibited features like pistol grips and adjustable stocks, or use a magazine that cannot be readily removed. Understanding these requirements before starting your build prevents legal issues and wasted money on non-compliant parts.
The Detail
California's assault weapon laws create two main paths for legal AR-15 ownership. The featureless route requires removing or replacing standard AR features like pistol grips, adjustable stocks, flash hiders, and forward pistol grips. You'll need a fixed stock, a grip wrap or fin grip, and a muzzle brake instead of a flash hider. This approach allows you to use detachable magazines normally.
The fixed magazine route lets you keep standard features but requires a magazine release system that forces the action to be opened before magazine removal. Several manufacturers make compliant magazine release systems, though the exact mechanics vary. This option maintains the traditional AR ergonomics while meeting state requirements through the magazine system.
All AR-15 builds in California must use compliant lower receivers. If you're manufacturing your own lower from an 80% frame, you must serialize it and register it with the state. Factory lowers are generally acceptable but verify they don't have features that would classify the rifle as an assault weapon in California's definition.
Barrel length restrictions also apply to your build. Rifles must have barrels 16 inches or longer unless you obtain federal tax stamps for short barreled rifles. California adds its own restrictions on certain barrel features and configurations, so research current regulations for your specific build plans.
Build Impact
Your feature choices will determine which compliance path makes sense for your intended use. Competition shooters often prefer featureless builds for easier magazine changes, while casual shooters may find fixed magazine systems more ergonomically comfortable. Verify current California regulations with official state resources before purchasing parts, as laws change frequently.