Ok, so I hit the range today intending to shoot a bunch of .22LR through my Advantage Arms LE17-22 (for my Gen3 Glock22) and finish up with a box of 40S&W. I went with my brother, and we ended up sharing a lane, so I didn't get quite as much shooting in as I would have liked because we were trying to keep it under an hour. Anyway, I ended up putting 160 rounds through my Advantage Arms kit. I was pleasantly surprised to have zero extraction/ejection problems this time out! Definitely a departure from my previous 3 trips to the range with this thing (see my previous AA report here). I was using a 550 pack of Remington Golden Bullets (36 gr). I did, however, experience something strange. I guess they're technically failures to feed, but they're not like FTF's that I've had in the past. Usually, when this thing FsTF, I have to drop the mag to clear the failure. Today, either 2 or 3 times, I pulled the trigger, nothing happened, I assumed it was a bad primer, so after waiting a moment I racked the slide, but nothing came out. The next round then (finally) chambered and fired just fine. It's as if it failed to even grab the round off the top of the mag. Is that a common failure? I should point out that my kit came with 1 mag and I recently purchased 2 more from Ambient Outdoors. I wasn't paying attention to which mag experienced the problem except on the last one, which was one of the new mags. I'm hoping this isn't a common occurrence, although 3 failures out of 160 rounds is far-FAR fewer failures than I have been experiencing with this kit up until today. I'm actually somewhat astonished by how much better this thing did today. I don't know if I lubed it differently or if it's just finally broken in (I have almost 1100 rounds through it now). As I said, I finished the range session with 50 rounds of Fed Champion 40S&W range ammo, and as the title suggests, I was using KCI mags (4 mags, 12 or 13 rounds loaded in each). These are the same mags I reviewed here. Let me say that until today, I have never experienced any issue with these mags, and I've probably put somewhere in the neighborhood of 500 rounds total through these mags, spread between them. On one of the 4 mags, today, however, I experienced 2 failures to feed BACK TO BACK. It was like BANG-failure to feed. Dropped the mag, locked the slide back (dropping the round through the mag well), put it back in the mag and the mag back in the gun, racked the slide, BANG-failure to feed. Both failures looked exactly the same, with the next round seemingly pointing "too high" to feed into the chamber. At this point I really feel these were both mag-related, although I don't know for sure. I've marked the mag, so I'll use that mag exclusively next time I'm out to see if I can reproduce the problem. I would be interested to hear the theories you guys and gals have about what might have caused both the Advantage Arms failures and the failures with the KCI G22 mags. I hope myself and others can learn from my experience and your wisdom. Thanks for reading!