Going to the range soon. Another 250 rounds and I will have 14,000 rounds through my G21SF. I have not had a single malfunction with many different brands and types of ammunition. I've never had a gun do that before. Not that I've ever kept track of how many rounds I've shot. Only did that with my Glocks. The first time she has a problem will definately freak me out since she's been so damn dependable.