I've got 14.8" RLGS and 15" ILGS barrels and they are smoother than all my 14.5" and 13.7" mids by quite a bit. I see one of the 13.7" ILGS barrels in my future, I've wanted to get a custom one made for a while but can't stomach the custom barrel price for what I'd use the gun for.
No clue...