Sold my AK without ever fitting the stock to the gun. Recevier block is some kind of synthetic, perhaps Delrin. Fitting may be required. $50.00 USPS Money order shipped. This is just a part and lawfull for anyone to own. If you live in a ban state YOU are responsibile for pinning the stock in the open position BEFORE permanently attaching this to your firearm. Know the laws where you live.