I was wondering if anyone could help me. I own a G27 (.40s&w) and I replaced the base plates on both magazines with Pierce +1 capacity extended base plates. I bought some Remington UMC ammunition; 2 boxes, 250 round a box I believe. I have taken it out on 3 different occasions and have had the slide stuck in the back position and the fired round expelled from the chamber, failing to feed the round. I can manually get the round to feed. It also happens somewhere between rounds 4-7. I fired the same ammo through my G22 and had no issues with feeding. I have not been out to try a different kind of ammo yet, but all I could figure is that it's either 1) bad ammo 2) bad or short magazine springs in the G27 magazines or 3) an abominable combination of both that it does this. Anyone else have an idea or know what's wrong here? If I get out and test new ammo I will report back with what happened. Thanks ahead of time for the comments/help.