Tyrone,
It’s a 16” barrel with carbine length gas tube.
Colt 6920's have a .062" gas port.
Perhaps someone here with a similar barrel that runs well could share their port size.
It doesn't work to compare gas ports for different cartridges and expect them to match. You're talking about a 5.56 barrel, he has a 7.62x39.
I don't know why everybody's talking about drilling gas ports anyway; nothing in Hudge's comments indicates the rifle is undergassed.
Hudge, I asked in post #5 in this thread about the type of failure, and you answered in post #8 that it tries to feed a new round while the fired case stays in the bolt. That's a bolt problem, not a barrel problem. You've got issues with either the bolt itself, the extractor, or the ejector. The easy button is to try a new complete bolt, if you don't know what issues you're looking for in the bolt you have. It may be something simple though like a piece of debris jamming the ejector pin.
A dirty or rough chamber may also be an issue combined with brass forming against that better than steel, as we already discussed.
Until you address those issues or provide more info, you'll just continue to get a lot of guessing, and most of it is pretty misleading to be honest.
