Found the same issue today. Got our Micro 380 and P238 at the same time. I ordered two extended mags and a three pack of springs from the Kimber store. One extended mag and the one that came with the gun ran fine, one did not. I thought it might be a bad mag, so I put it in the P238 and it ran fine. When I put a mag into the P238 there is an authoritative click, not so much with the Micro. I have been nothing but happy with my Stainless Target II, but I'm not impressed with the Micro so far. It shoots fine, but I expect mags to stay in the gun. I have never had a mag issue with any of my pistols, (Beretta, Springfield, S&W, and Sig). I'm requesting a RMA number tomorrow. Hopefully it works out.