USED Proof Research Bolt Action Barrel Carbon Fiber .277 Caliber 24in 1-10 Twist CF Thread Sendero 5 Groove. These Rifle Barrels come in some of the most popular as well as niche calibers so that you can build the rifle of your dreams using the latest in carbon fiber barrel technology. The Proof Research Bolt Action Carbon Fiber Blank Barrels is lighter and more durable than steel options of the same length lending itself to increased accuracy and barrel life. Pick one up today to take your favorite bolt-action rifle to the next level. Specifications for Proof Research Bolt Action Carbon Fiber Blank Barrels: Manufacturer: Proof Research Barrel Material: Carbon Fiber Gun Type: Rifle Flutes: No Features of Proof Research Bolt Action Carbon Fiber Blank Barrels: Lightweight: Up to 64percent lighter than traditional steel barrels of similar contour Extreme Temperature Resistance: Improved heat dissipation for cooler and longer lasting barrels Unprecedented Durability: Wrapped with high-strength aerospace-grade carbon fiber impregnated with a proprietary matrix resin Package Contents: Proof Research Bolt Action Carbon Fiber Blank Barrel Proof Research 130513: Bolt Action Barrel Carbon Fiber .277 Caliber 24in 1-10 Twist CF Thread Sendero 5 Groove