I was finally able to get out to the range and try out my new M&P 9, this was my first handgun. I put 400 rounds through it without a hitch, no dropped mags etc. It was quite accurate as well. After a good day of shooting I went home and started cleaning. This is when I noticed the problem. All around the 'striker hole' ( sorry, like I said I'm new) was deep pitting. A little background on the ammo fired, 250 rounds-factory (124 gr fmj Am. Eagle) and 150-rounds reloads ( 125 gr. lead, 4.4 gr. bullseye powder, cci primers) Any ideas on what would cause this? By the way, great site.