I have 2 as new yugo sks's both with the same problem. The firing pins stick in the firing pin holes in the bolt face. I have dissambled both and thorougly cleaned and looked for burrs or signs of being bent and they look fine. I thaught about using some very fine polishing compound and lap them in. I don't want to enlarge the holes any so I am hesitant. any Ideas? My sons doubled on him yesterday and scared the crap out of him. the fired case looked like a slamfire since the primer wasn't dented normaly. it was a bigger flattened dimple on it instead. we were using wolf milsurp stuff.