I have a Norinco SKS that appeared to be unfired, and it shoots well. One small problem that I have with it, is the screw that acts as the pivot point for the spike bayo, seems to be backed out partially. (Head of the screw has a gap between it and the bracket)Is this normal? I tried screwing it in, and it doesnt budge. Anyone else have a similar screw?-Thanks Brothus!