bigj, I have read the 922r, yes you have to have 10 foreign parts, must sks' have 15 foreign parts, the yugo has 17. I have changed out opt. piston with a tapco (1) the tapco t6 would make 3 making it 10 foreign parts thous it still in the 922r. still have the orginal opt. piston so I can swap that out if I have to.