If you live in California you will need our AR California compliant bullet button. The CA compliant bullet button replaces the existing mag release and it allows the user to drop a magazine with the use of a tool or tip of a bullet. It prevents finger manipulation of the mag release, and creates a condition allowed under current individual interpretations of California law for California Sales & for personal use. The CA Compliant Bullet button installs in less than a minute. The installation is not permanent, and can be reversed just as quickly, in case you move out of the State of California. No gunsmithing required.