11-07-2011, 02:35 PM
This also is on my future project list. I would think if the gas port is sized correctly, a 10.5" carbine length gas system in 6.5 would run like a top. I have a 10.5" .223 that I had a lot of trouble with short stroking initially. It now runs fine after opening up the gas port in the barrel. One thing you would need to be careful of is not opening it too much for shooting suppressed. I have a switchable gas block with ports sized for shooting suppressed & un-suppressed.