So earlier this week while browsing some of my local gun shots I picked up a ProMag 10 round magizine. So for $17 USD I figured what the heck I'll try it. The guy at the store says at best it is a range mag. He wasn't kidding. I had a few FTFs and once instance of the slide not locking back on empty on three attempts to use it. If you're looking for a mag to use for malfunction training this seems to be a good Mag for that. I used my ACT and Wilson Combat mag during the same session and didn't have any issues, so (as you guys most likely know already) it definitely was the ProMag.