For sure! Pinky is a 16" midlength, and that thing might look funny, but it's one hell of a shooter. The other 16" midlength I have is a precision rig, the Spike's billet set with the Wilson/Nordic barrel. That thing is smoooooooooth.
Carbine gas system was a direct development of rifle gas system on the A1/A2 with the 20" barrel. Dwell time - distance from the end of the barrel, back to the gas port location. The amount of time (or distance) that gas is entering the gas port, before the bullet leaves the barrel. It's almost identical on the 20" A1/A2 barrel (from end of barrel back to gas port location) as it is on the 14.5" barrel carbine. End of carbine barrel back to the gas port location, of the carbine gas system.
Civilian-legal barrels must be a minimum length of 16", so carbine gas systems in a 16" barrel have longer dwell time. A 16" AR with carbine gas feels a little "more harsh" or has "more recoil" than the military 14.5" carbine - because of that extra 1.5" of barrel. More dwell time.
Midlength gas systems started out as an alternative on a 16" civilian-legal barrel, to replicate that magic amount of dwell time of the A1/A2, and the military carbine with the 14.5" barrel.