Alright, i first had this happen when my friend was firing my M&P9. At first I thought it was just because of limp-wristing since before then I had fired a few hundred rounds through it without a problem. And since then, I've fired many rounds through it also without a problem. The strange thing is, since that first time it malfunctioned with my friend, two other friends have reported similar problems. This time, I didn't think limp-wristing is the culprit. The reason is one of them is a former Marine and is probably more experienced in handgun firing than I am, and he mainly fires larger calibers like .45 ACP and from what I've seen of him shooting does not limp-wrist at all. So I don't know why he's getting the problems, but for some odd reason, I still don't get them. Is there a reason for this or is it just luck or what? I've read in another thread someone having similar problems and he said it only happens when he uses WWB ammo and not Remington ammo. I have been using WWB ammo since you can get 100 rounds for like $12 at wal-mart, lol. Should I also try Remington ammo instead?