X-Caliber is now offering Carbon Fiber AR9 and AR45 barrels for your next, lightweight AR-based PCC build. These 416R stainless steel, carbon fiber wrapped barrels are available in lengths from 7″ to 16″.
The AR9 barrel has a 1 in 10″ twist and the choice of 1/2″x28 or 5/8″x24 muzzle threading. The AR45 barrel has a 1 in 16″ twist and the choice of 5/8″x24 or 11/16″x24 threading.
You can learn more at X-Caliber.net.