I researched this quite a while back and don't remember what the general consensus was (if there was one). Is there an optimal barrel length between 10.5" or 11.5" barrel when using a carbine length gas system? I know either will shoot fine, and I'll be using an adjustable gas block I'm just curious if anyone knows if there is a noticeable different between recoil impulse / smoothness in shooting? I know pressures change a decent amount the further/closer the muzzle is from the gas port, I just don't remember which direction. Thanks for any input.