That Sig Mosquito is a nice gun, I have one, the only problem I found is that Blazers and CCI mini-mags in round nose are about the only rounds that give consistant feed. Where the bullet feeds into the chamber if you look closely there is a small lip that the nose of the bullet catches on. I'm going to take a dremel and zip that little edge down so that there is a smoother feed and see if that helps. Also after a few thousand rounds are fired through it, they seem to work better. I still have a few issues with the feed on mine but not as much as when it was new. So I need to get that dremel out.