I have a Stag Arms AR with the CMMG dedicated 22 upper, not the conversion kit. I'm having serious problems with mis-feeds! I found this link here: http://www.ar15.com/forums/t_3_15/526872_How_to_make_your_AR_22_run_smoother_NOW_with_pictures.html&page=1 So, I brushed out the proximal end of the barrel as well as polished the feed ramp. Now, I forgot to get a polishing chemical, but I made that feed ramp damn near shine. Before these mods I was literally mis-feeding at least twice with 6 rounds in the mag (it was horrible). I'm now mis-feeding two to four times per 25 rounds. I love shooting plates with this gun, but having to fix the mis-feeds is totally killing the flow! I was trying to see what mags I have, as I've heard some are better then others, but I have the mags CMMG themselves make. I've heard good things about Black Dog mags, but seeing as how it's CMMG mags, I'm not sure it'll make much of a difference. I'm at the point where I"m almost ready to just sell the upper and buy an AR22 or 10/22 with a new stock and 25rnd banana mag. IDK, any pointers or ideas? Also, I've read that they seriously recommend NOT taking apart the bolt-carrier group as people end up damaging the rails and throw the spec off. I have NOT disassembled this, I've only removed the bolt carrier group and slid back to access the feed ramp. Also, I spent quite a bit of time getting the old lubricant off, and then oiling the rails, hoping this would reduce any friction...no luck. Any info is certainly appreciated!