I've tried something like that before. I don't recommend it, because every time you fire a shot the barrel gets hotter and longer, and the torque on the nut changes. They never shot as well as a normal barrel setup. As for not feeling the heat on the outside, where does he think the heat goes? It's just like the carbon wrapped barrels. Sure they are cool on the outside. Keep the heat on the inside so the barrel gets destroyed. Great idea. You want the thing to radiate heat as fast as possible and get rid of it so the bore stays cool as possible.