It depends on the "AK". My nephew ordered a WASR10 (semiauto AK-type rifle) maybe six months after a buddy picked one up. The buddy was mightily PO'd that he couldn't get the "barrel nut" off to install a different muzzle device. My nephew had noooo trouble gettin his nut off & ended up buying the device from the buddy.
These BS importation laws cause manufacturers to do some silly things to decent firearms at different times. Check the nut & ask the owner.
Dead Bears, the only good kind.