What Are the Assault Weapon Laws in California?
Woody's answers are based on published federal and state law. Not legal advice. Consult a licensed attorney for your specific situation.
California bans assault weapons by name, features, and magazine capacity. Semi-auto rifles with detachable magazines and certain features like pistol grips are prohibited. Existing owners must register or modify their firearms to comply.
What This Means for You
California's assault weapon laws are among the most restrictive in the nation, affecting nearly every aspect of rifle building and ownership. The state uses both a banned-by-name list and a feature-based definition that makes many common configurations illegal. Understanding these laws is critical before starting any build, as violations carry serious felony penalties.
The Detail
California defines assault weapons through multiple criteria that builders must navigate carefully. The state maintains a list of specifically banned firearms by make and model, but more importantly for builders, it prohibits semi-automatic rifles that can accept detachable magazines and possess certain features. These prohibited features include pistol grips, telescoping or folding stocks, flash hiders, grenade launchers, and forward vertical grips.
The magazine capacity restriction adds another layer of complexity, limiting most firearms to 10-round magazines. This affects not just what you can use, but influences the entire design approach for your build. Semi-automatic rifles that have a fixed magazine with a capacity of 10 rounds or less can legally possess the otherwise prohibited features, leading many builders toward fixed magazine solutions.
Registration requirements apply to firearms that were legally owned before becoming classified as assault weapons through legislative changes. However, registration periods are typically limited and closed to new registrants. The state does not generally allow new assault weapon registrations for civilian ownership, making compliance through modification the primary path forward.
Compliance modifications typically involve either fixing the magazine so it cannot be readily removed, or removing the prohibited features while maintaining detachable magazine capability. Each approach has trade-offs in functionality and ease of use. You should verify current requirements with California's Department of Justice firearms bureau, as these laws change frequently and interpretations can shift.
Build Impact
You'll need to choose between a featureless build that removes pistol grips and other prohibited elements, or a fixed magazine design that allows normal features but limits reloading speed. Either path significantly affects your parts selection and overall rifle functionality from the start of your build.