Got my XD a few weeks ago. Shot at an indoor range with some American Eagle ammo. 300 rounds without a single hiccup and never cleaned it. Went to an outdoor range and shot some yellow box UMC ammo yesterday. About halfway though the first box of ammo and a mag, I pulled the trigger, heard the striker "click"....nothing....no bang. Dropped the mag, ejected the round. No even a dent on the primer. Odd. I had two FTFs after that. One of the rounds in the top of the mag got scratched real bad by the round that was being fed like the brass from the round being fed dug into it as it was being loaded. Not sure what the deal is. The rounds I was shooting felt a little more powerfull than the indoor rounds. Think maybe it could be recoil spring not cut out for the more powerfull rounds or something? I'm cluless.