When they first started to do carbon fiber wrapping, they had problems with its holding in heat, couldn't keep it bonded to the barrels and a few other things like it being heaver or thicker is a better way of saying it where they would have an overlap in the fibers. I see that they have changed a few things and the way they are doing it now, some of the barrels even have slots, for better cooling, in the carbon wrap. I can't see a carbon wrapped barrel holding up to being banged around, like happens to a truck gun or on a four-wheeler, or horseback packing in and out of camp. I think that most of them are made of 416 stainless steel barrels and then turned for the carbon fiber to be wrapped. I am not sure what they use as the bonding agent but the ones I've seen were a nice matt finish and looked good. Most of the people that I have talked to said that the biggest advantage for them was the weight to stiffness ratio, as they weigh less.