oh a bulgarian 74 gas block will work perfectly and is absurdly chaper than a real russian gas block. the best place to get one is from one of the venders on the ak boards that are selling bulgarian 74 parts in fact zteknik buys alot of stuff from one of them (as do i) either one of us could give you their contact info if you'd like, i just bought one myself for a project and i think it was like 25 bucks for an as new gas block