just got gun home, shot 30 rounds through tapco flawless. Haven't tried circle 10 or modded factory mags. He charged me $50 , which i kinda bitched about at first(not in front of the gunsmith,just grumbled at the cash register). The guy at the counter said it took him 2 1/2 hours and that he had the entire gun apart. Plus, obviously I screwed it up.Oh well, money well spent if it holds up.