Matt has a point about strength.........in my case I am stuck, to shoot that gun well with my hand forward, I am indexing right on the gas block. If I was going to lighten the front of the CTR, the carbon fiber is worth it there, not sure at the difference between a 15" VTAC and a 15" CF has to be half a pound.
My house gun has the troy, I am going to put one on my wife's carbine, the small diameter, holes and texture make for a fantastic gripping surface, but alas will not fit on that firebird nut, but I am going to measure the OD of that nut, maybe I will drill holes in something, to make fit...