Almost 2000 rounds thru it. No major problems. A few minor, but no more than my 10/22. Not a single stovepipe. Loads, ejects, fires flawlessly, when not useing GB, you know which one that is. Make sure you load the mags correctly, always push down on the round your loading. Use the helper on the follower just to make it easier, do not let the bullets become slack. Federal bulk functions perfect, performs, well, ok. There are quite a few fliers, by a couple inches is all. The higher priced, higher velocity seem to work the best.