Smoke Composites makes advanced carbon fiber AR, PCC and 308 components. Free-floating hand guards, butt stocks, and more. Lightest in the industry.
www.smokecomposites.com
Not sure if you are aware but these guys supply XLR with their stuff. Seems like their prices are cheaper as well. If you call them Cali is super helpful. They will build you anything any length you want if I'm not mistaken. I prefer skipping the middle man by going directly to the source. Disregard if you're already aware.