This may be completely ammo related but I had 2 separate FTF issues with my HK45 yesterday (shooting it for the 1st time). I was using Winchester white box and both times when I inspected the unfired round it seemed the primer strike was weak since the indentation was shallow. I didn't have time to try different ammo but I will tomorrow to see if that's the problem. The other 48 rounds fired normally. My experience with semi-auto handguns is limited so if anyone has any suggestions I'd appreciate it!