I have been thinking about buying a used Norinco semi auto "AK 47" rifle from my local shop. It looks rather old...says imported by Norinco on the reciever, has full wood stock, forend, and pistol grip.(No thumbhole). Don't recall if it had bayonet mt or flash suppressor. My question is are there any legal concerns I should have concerning when, where, and if this rifle was assembled at a time other than when it would have been legal to have been assembled? I read somewhere that if you are buying a "pre-ban" used rifle to take caution that it may have been assembled "post ban". Is there any sure way to know or what to look for to avoid a possible problem aside from just asking the seller?