I have a sendra lower from before 1994 in great functional condition but poor loved asthetic condition...i assure you all defects are asthetic and not functional. The upper lower fiti is TIGHT without a accuwedge (only tried a bushmaster upper on it). I really really really want a lower marked law enforcement use only. I have pics so contact me if you are interested. BTW when Sendra went out of buisness BUSHMASTER bought thier tooling and began to manufacture with it, so these are great lowers!