Hey guys. New to the site. I'm in the beginning stages of building a MK18 inspired pistol/sbr. Decided on an 11.5 barrel. O was deciding between a ballistic advantage and a rosco bloodline when I came accross the faxon heavy gunner barrel. The difference with the faxon is that the gas system is a midlength instead of a carbine like most 11.5 barrels. I know the claimed advantages of a mid vs carbine (less felt recoil, less gas blowback blah blah blah) but the advantage of a 11.5 over a 10.5 is dwell time. So my question is would the mid length gas system counteract the advantage in dwell time on the 11.5? And would that effect on velocity and powder burn be worth the supposed benefits of the mid vs carbine length?