Proof Research Barrel Bolt 224 20 Length 8 Twist 4 Groove Cf Sendero. These Rifle Barrels by Proof Research are constructed from steel that has been forged to create the ideal barrel for your needs. You can select a Proof Research 20in Button Rifle Barrel in a variety of calibers to ensure the best accuracy possible with any action. For additional customizations you can check out other Proof Research Rifle Barrels as well as Proof Research Breech Extensions and components. Before you build your custom rifle make sure you grab the Proof Research 308 Bolt Action Barrel Blank for the perfect start to your project. Specifications for Proof Research Carbon Fiber 20 inch Rifle Barrel: Manufacturer: Proof Research Color: Silver Barrel Length: 20 in Barrel Material: Stainless Steel Flutes: No Features of Proof Research Carbon Fiber 20 inch Rifle Barrel: Carbon Fiber Available in a variety of calibers Designed for bolt-action rifles Package Contents: Proof Research Barrel Bolt Cf Ss 20in Length What firearm models does the manufacturer say Proof Research Carbon Fiber 20 inch Rifle Barrel is compatible with? The manufacturer says that Proof Research Carbon Fiber 20 inch Rifle Barrel is compatible with Ruger PrecisionProof Research 103449: Barrel Bolt 224 20 Length 8 Twist 4 Groove Cf Sendero