I recently received my 1911 Carry, Nitron finish with rosewood grips. On the first outing, I ran 50 rounds of Remington green box through it and experienced several failures to return to battery, usually on the last round of a mag. A slight nudge would see the slide finish its travel. Mags were factory, plus one Chip McCormick Classic 8 rounder. All mags performed the same. The gun was fresh off the FedEx truck. Went back out a few days ago with WWB, same mags, a pretty oily pistol, and a slightly polished breech face. Approximately 150 or so rounds with no issues whatsoever. She's purring like a kitten. Fit and finish are what you expect from Sig. Gun is very smooth. One of the factory mags came with a little ding on the feed lip. I straightened it a bit and it works although the follower hangs a little. Sig has sent me an rma and will replace it. Very pleased with the gun. I traded into this one from a Ruger SR 1911 that I just couldn't get to run 100%. The Sig is overall a much nicer pistola IMO.