OMG, gas rings are about the first thing one looks for. Its so easy. Guess we all failed to think back to bare basics...
Its one reason I never am without a proven totally spare BCG for backup...
Swap it in and all works, you at least know where the problem is.
I went out this morning and brought a box of Fiocchi factory ammo and three handloads, fired 10 rounds, all ejected fine, first handload 24.4 gr H 335 55 gr fmj, fired 10 rounds, one failed to eject. next handload 25.5 gr A2520 69 gr Sierra tmk, fired 10 rounds, two failed to eject, fired 10 rounds of same bullet loaded with 25.5 gr Alliant power pro 2000, two rounds failed to eject. one thing I did notice is that the H 335 ejected the cases a little farther than the other loads, however I did notice that the ejection pattern with all loads was different. The cases ejected at different angles, example the Fiocchi ammo, first two rounds ejected at 2:30, third and fourth rounds ejected at 4:00, fifth round back at 2:30. I am going to take the BCG out of my other AR and use it to shoot the same loads that I shot today, if they all shoot fine and ejection pattern is the same then I am assuming the extractor or maybe the gas tube may be causing the problem, don't think it's the lower.
