In CA you literally have to wait 10 days to pick up a bare receiver. I guess that is the cooling off period for really fast builders, just in case. Of course the clock doesn't even start until your local shop has the receiver in hand.
Oh, and what really kills me... You can legally own a high capacity magazine acquired before 1999 and you can legally use it with a registered CA AW or featureless rifle. However, plug that magazine into a rifle with a bullet button and you just manufactured an AW under CA law. You could be convicted of a felony and lose all rights to firearm ownership.
CA gun laws are a minefield.
Oh, and what really kills me... You can legally own a high capacity magazine acquired before 1999 and you can legally use it with a registered CA AW or featureless rifle. However, plug that magazine into a rifle with a bullet button and you just manufactured an AW under CA law. You could be convicted of a felony and lose all rights to firearm ownership.
CA gun laws are a minefield.