CA has a law stating you cant have a detachable mag and a pistol grip amongst many other "evil" features as they are referred to. The easiest way around the law is to fix you magazine to the gun so it cant be removed without a tool. Two styles are the Prince 50 Mag Lock and the Bullet Button. The P50 locks the mag in place using an allen screw so you have to break the receiver apart to top load 10 rounds into the mag. The BB is a mag locking device that uses the tip of a .223 bullet as the tool to release the magazine. Thus how im allowed to own an AR style rifle in Commiefornia. I currently have to take my receiver apart and load in a 10 rounds.
You also cannot fix any magazine capable of accepting more than 10 rounds. CA also has banned many lower recievers so the CA legal receivers are often referred to as Off List Lowers or OLLs. Welcome to he communistic state
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