Different lengths are for different players.
Longer barrels tend to make it easier to hug to your bunker and pop your gun round the slightest bit.
Smaller barrels tend to work better for fronts who need the tinest profile possible, don't want a 20" cannon sticking out of your bunker now, eh?
I think air stops expanding after about 8/9inches, and the rest are just cosmetic.
Or do you just like having a longer barrel because it makes up for other things Virture?
