I've got a Cali legal AR, get the prince 50. It's easy to install, I recommend using the allen screw over the bullet button and both should come in the pack. The collapsible stock is fine, the flash hider not so much. Those are illegal, what you want is a muzzle break. If it looks like a flash hider you just have to prove that it's not. So far I've had no problems, my friend sells firearms and he took care of me. Just get your stuff locally if you can and you should be alright. Where in Cali are you?