When it shoots brass it’s pretty much a double feed type. So it tries to put a new round in the chamber and the empty case stays in the bolt. The upper is new, and I did not notice issues with the spent brass casings. The mouth of the case has a dent in it, it so does all of the steel casing it shoots just fine.
Hudge said, "I think the problem is a rough chamber or feed ramps at least is the issue issue. I went out again today with a clean chamber, and a heavier buffer. First mag I ran through it was all brass, damn thing was a single shot. One shot and failure to eject, clear it and fire again, same thing. I put in a new mag with all steel casing, not one hiccup. I looked at the brass from the ones I had issues with, and there are rough spots on it. I got home and broke the AR down, and put my pinky on the feed rails, darn near cut my finger it was so rough. I guess I'll brake out the Dremel and give it a nice polish. The only problem, I won't be able to hit the range again for several weeks."
If the empty case stays in the bolt it might be under gassed/powered. In other words it sounds like it’s short stroking. Load one round and see if it locks back on an empty mag.
No it was fine with running one in the Mag and then it locking back. It’s only when more than one that is brass cased in the magazine that it acts up.
No worries though, I ordered a new gas tube and gas block for it.
