Not sure if this is working out. At a 3-gun match, I thought I noticed inconsistent reset on a couple shots, where I had to fully let go of the trigger for it to reset once. Didn't think much of it. But this weekend, it happened again.
Then it got worse. On two shots, the trigger didn't reset at all. Pushing the trigger all the way forward, didn't do anything. I'm not sure if there was a hang-up, or what. It behaved as though the hammer was already down. Upon manually cycling and inspection, there was some marking on the back of the ejected live round. Cycling the gun reset everything and it shot fine thereafter - until it did it again. Happened twice out of 150 rounds.
Never had this type of failure before. I'm inclined to suspect the spring is the issue. Does that ever happen with an AUG? Does it ever happen with just a 2020 sear in an AUG. A shame, as it markedly improves the trigger, but if it makes the gun unreliable...
This did occur with some ultra-light reloads (40 gr bullets with a weak charge), that reliable feed and cycle the gun. But maybe a weaker stroke and so doesn't work as good with the trigger timing? Difficult to see that mechanically, since if it cycles and feeds, then the bolt is making it all the way back, and hammer certainly has to be cocked by that. Only thing I can think is the spring tension isn't enough to get the secondary sear to capture the hammer fast enough now? Not sure.