Proof Research Pre-Fit Carbon Fiber Barrel Features The Proof Research Pre-Fit Carbon Fiber Barrel begins with a full profile match grade 416R stainless steel blank that is turned down to a reduced contour before being wrapped in high strength aerospace grade carbon fiber. That carbon fiber layer is impregnated with Proof s proprietary matrix resin developed by its advanced composites division and is engineered to diffuse heat along the length of the barrel much like fiber optics transmit light. Because carbon fiber moves heat so effectively through the wall of the barrel this 7mm PRC build cools faster between strings of fire and holds its accuracy over longer range sessions. The result is a barrel that matches the precision of a fine steel barrel while weighing considerably less. This pre-fit barrel is chambered specifically in 7mm PRC with a 1 in 8 twist rate and a 22 inch length finished with a 5/8x24 thread pattern and built to fit the Defiance Tenacity action platform. At roughly two pounds twelve ounces the barrel sheds substantial weight compared to a traditional steel contour of similar length which benefits shooters carrying a rifle long distances in the field. The Sendero style contour gives the barrel a balanced accuracy focused profile suited to both hunting and long range precision applications. For sale at GrabAGun this Proof Research pre-fit barrel is a durable weight conscious upgrade for a Defiance Tenacity build. Proof Research Pre-Fit Carbon Fiber Barrel Specifications Manufacturer: Proof Research Model: Pre-Fit Carbon Fiber Barrel Caliber: 7mm PRC Compatible Hosts: Defiance Tenacity Barrel Length: 22 Twist Rate: 1:8 Thread Pattern: 5/8x24 Material: Carbon Fiber Color: Carbon Barrel Contour: Sendero Weight: 2.75 lbs Available At: GrabAGun