Proof Research 100028 AR-Style Barrel 308 Win 18″ Rifle Length Gas System 1:10″ Twist 5 Grooves, 5/8-24 tpi, Carbon Fiber Wrapped

Up to 64% lighter than traditional steel barrels of similar contour. Improved heat dissipation for cooler and longer lasting barrels. Wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin.