Again, an adjustable gas port won't help your problem. They restrict gas, your rifle already doesn't have enough. There is absolutely no value at all in an adjustable gas block on an undergassed rifle; it would be like putting a throttle restriction on your Honda because it doesn't have enough power.
Nothing wrong with using one, but fix the problem first.
You have to measure the diameter of your barrel at the gas block, that is the number you're asking about. Yours is probably .750".
Carbine length gas in 300 Blk is known to be more picky about cycling. Please measure your gas port and report back; if it's not a full .125" already you might be able to open it up a little more.
Last edited by Yondering; 08/29/16.
