The Bolt Retention System (BRS) is the best drop-in CA Compliant solution for your AR-15 rifle or pistol. With the BRS, you can say goodbye to magazine locks and featureless grips. After a quick 5 minute install, you can have a fully featured AR15 with detachable magazines - all while staying compliant with Assault Weapon Bans. When installed, the BRS converts a semi-automatic firearm into an interrupted action firearm - causing the firearm to fall out of the definition of "Assault Weapon" despite having traditionally banned features.  Check out the videos on this page to see the BRS in action. *Patent pending Note that this device is only compatible with the AR15 platform. AR9 and AR10 variants are in the works and will be released in the future. This product cannot be shipped to: MA, NY, WA, IL