I was talking to a guy with a store in California and I didn't realize just how restricted the gun laws were there. He thought California had the toughest gun laws in the world until I told him about Canadian laws. But if you are building an AR type rifle with the adjustable stock do be sure to get a stock that slopes down for ease of shooting rather than the straight stick like stalk. Makes shooting so much easier with or without a scope. Also not sure what round you will be shooting but I know a lot of guys like the dirt cheap Chinese ammo. Just keep in mind while it is dirt cheap to buy it is a very dirty corrosive ammo and you'll need to really keep the gun cleaned after each use far more often than with .223 rounds.