I believe you are thinking of rifle length gas, which is at 12”. Last I checked, a mid length gas port is at 9”, or about 3.5” from the muzzle. A 10.5” barrel with carbine length gas has the same. 12.5” mid length with a properly sized port is a great suppressor host for several reasons, but is probably a pretty bad idea unsuppressed unless you have that gas port tuned specifically to the ammo you are using. Even then without a suppressor it would likely be temperature sensitive enough to be annoying, swinging from undergassed to overgassed if set up improperly . Moreso than a 10.5” due to the overall lower pressure and necessarily larger gas port.
Or at least that is my understanding of the situation, clandestine is probably shaking his head in disappointment at yet another dumb build by me haha. All I know is left handed shooter + 12.5” midlength = no gas bukkake and velocities within about 100fps of a typical 14.5” barrel.
