This BSF Carbon Fiber Barrel is a 416R stainless steel match grade double stress relieved barrel. This barrel is sleeved in a roll wrapped carbon fiber that is three times stronger than steel, providing ultimate rigidity while remaining extremely lightweight. The carbon fiber is drilled for rapid heat dissipation. 95% of the carbon fiber does not touch the stainless steel creating air gaps and allowing air to foil around the steel and cool the barrel faster. BSF Barrels guarantees accuracy, durability, and the lightest .936 bull barrel available.