I have a mossberg 500 and have probably put literally thousands of rounds through it in ten years, and have never had a miss-fire, or a shell not eject. I have shot every kind of brand and type you can imagine, slugs, 6,7, and 8 shot(different barrel of course) and most of the time I even just buy the cheap shot from Wal-Mart to shoot clays. I would send the thing to Remington just to be sure, because that thing should be as reliable as a Glock.