Check out the Kahr forums, they have a lot of info on the break in. I followed one of the posters suggestions to clean, lube, and do some light polishing before shooting. I think I had one Fail to Feed in the first 200 rounds, no issues since. The one problem was with the 7rd mag and there were reports that they weren't as reliable. Since then I've done all my shooting with the 6rd. Mine is the CM9. I found it too big for pocket carry and use an IWB from pjholsters. Trigger takes some getting used to, more like a double action revolver than a crisp striker fired auto. If I was buying today I might get the sheild instead.