Carbon fiber is a great heat sink as long as the proper fibers are used and its bonded to the surface correctly. That said it would be great if someone published data on the subject. Being a curious guy I would like to know the thermal properties, the temperature curve the barrel goes through and what really has me curious how much carbon fiber is enough to dissipate the heat properly? Does matching the barrels diameter just happen to give you what you need? Is more better? up to what point. I sure like the idea of these barrels of course Im drifting off topic here