As of now I dont have a AR barrel. But this brings up some interesting questions I have considered. I have a very complete CNC and manual shop at my disposal. I like stuff thats out of the ordinary. I had considered buying a bull barrel and doing some mods such as fluting it on my own. I have also considered some type of cooling fins to increase surface area and help dissipate heat. Let me know how you make out turning your barrel or post up some pictures.
Concentrated power is not rendered harmless by the good intentions of those who create it.