First of all I am pretty sure my issues are solved. I purchased a brand new MKIII target. I had not even bothered shooting the gun, before I ripped it's guts out. Installing a Volquartsen trigger kit really does make a major improvement. Shooting the gun, I experienced three stove pipes in the first 50 rounds. The failure to extract I attributed to the gun being new, and not broken in. Still, I couldn't take the chance of a stove pipe during a match. I went ahead and ordered a Volquartsen bolt kit. After getting it installed, I took it out back to test fire it. Shooting the same magazine I had been using for the last 400 rounds, and the same ammo Winchester Super X. I experienced one stove pipe right after another. Doubting the new parts caused this, I broke out my extra magazines. Two would cause serious stove pipes, and two were reliable. I was aware of the magazine fix though. I took one magazine, and polished up the feed lips with a Norton triangular india stone. I only had time to run 15 rounds through the magazine, but it seemed to solve the problem. I hope to experiment with it more next week. The number one cause of stove pipes in the MKIII, is the crappy stamped extractor. A fix of course is replacing it with a better part. While I am not sure what was going on with the magazine, polishing the feed lips helped. I did not file them off to the extreme as some, but only enough so the round doesn't slow down coming out of the magazine. Wanna kill these ads? We can help!