I've got 700 rounds through mine as of today. Didnt have a single issue in the first 300, changed the trigger out for hyperfire at the 100 mark. Today put 400 rounds through it (3 manufactures 7 loadings) had about 4 of these failures to extract in the first 150-200 and then good rest of the day, 4 different styles of mags. In mine at least it only seems to become an issue if there's a lighter charged round, ymmv. In mine I'm hoping its purely a not clean problem as I've only oiled and not properly cleaned it yet.