02-14-2018, 05:29 PM
Maybe this is implied in your post, but have you tried running it with the gas block opened more? If not, I'd try opening it all the way to help eliminate undergassing as the culprit (or at least mostly eliminate, as I'm currently dealing with undergassing on a fully open block but that's on a 12" barrel). And if your still restricting gas flow through the gas block, you don't need to worry about your gas port diameter just yet.

