Still fighting issues.....

[LRRPF52]

I have the 7.62x39 extractor, just tried the 5.56 to see if it made any difference. Still didn't. So I still have 6.5 grendel that I am fighting cycling issues. I feel like its the chamber since the upper portion of the case is scratched/dull from the previous pictures which I feel could cause an issue once things heat up and start constricting.

With MLGS 18" barrels, if the port size is too large, you'll get too much gas into the expansion chamber inside the carrier quickly, which will cause the carrier to begin moving earlier and faster than the optimum window for the gun.

The brass will still be purchased to the chamber walls under obturation, and it will play tug-of-war with the extractor. The extractor often loses that battle, slips off the case rim, leaving the empty case in the chamber.

You also have a tighter .295" neck with .264 LBC-AR and imitation chambers based off of Les Baer's chamber, which may or may not be held to Les Baer's spec. BHW told me that they hold strictly to the .264 LBC-AR chamber, but they are at the mercy of the reamer maker unless they measure reamers with optical comparator.

Anyway, a tighter neck isn't going to help with a MLGS 18" barrel that is ported too large, and even adjustable gas will barely keep it managed sometimes unless you buffer it heavily as well.

After reading over the thread again and looking at the extractor lip rips in your rim, I think most experienced AR15 trouble-shooters would lean towards your cyclic rate being clocked way too fast.