I have a G3 G23C and can't remember any misfires with OEM or Storm Lake barrels. I got an AIM surplus 40/9 conversion barrel a few months ago and posted about it; the slide seems to stay back a tiny bit further than with the OEM barrel. The lockup test and everything appears to be copacetic. it shoots okay (POI is a little low and left compared to OEM) but I get BTF and even cases going left. I haven't tried a 9mm extractor. Last night I shot a couple mags and I had a misfire with S&B ball and with Magtech ball. Both primers had strikes but were obviously not firm enough to ignite, and both went off upon rechambering and re-strike. Thoughts? Fluke?