I recently got a .357 Sig Storm Lake barrel for my M&P compact. Took her to the range today and shot 70 rounds through her. 50 fmj's and 20 Speer GD. The first mag were the Federal fmj's. 10 rounds through. No problem. Second mag, the first round failed to eject. Kinda surprised me because I've never had a mishap when i shot the stock 40 s&w barrel. Anyway, the rest of the 70 rounds performed flawlessly. I was just wondering if it may have been ammo related, extractor related or maybe the barrel needs to be broken in. Kinda new to the technical aspects of guns so just looking for some insight.