While collecting my brass at the CMP shoot today I noticed that my firing pin was hitting a little off center on most of my brass. I was dead center on some of them. The rifle ran great as usual with no FTF. When I got home and tore it down everything looked good, the pin didnt appear to bent. The rifle is a Bushy A3 20 in. standard xm15e2s there is about 1200 rounds through it. The ammo was Federal xm193. Is this a normal occurance or do I have a problem? Is it the ammo maybe? Is accuracy effected by this? It didnt seem to be off to me. Should I just keep shooting it?