The Proof Bbl Cf Blank Bolt .308 Sendero 22 1-8 from Proof Research delivers a precise, ready-to-build foundation for high-accuracy rifle setups, merging a Sendero contour with a lightweight yet rugged design that excels in long-range performance and field reliability. Crafted for .308 caliber applications, this 22-inch barrel features a 9 twist rate optimized for a wide range of match and hunting loads, ensuring stable bullet stabilization and consistent vertical control at extended distances. The barrel breech measures 2.5, and the shank diameter sits at 1.20, contributing to a balanced balance of stiffness and harmonics that shooters rely on for repeatable shot consistency. Weighing just 2lbs-13oz, it provides a favorable weight-to-s rigidity ratio, enabling nimble handling whether perched on a bench or carried across rugged terrain. Built by Proof Research, this barrel is designed to integrate seamlessly with blank bolt components for those seeking a streamlined, aftermarket upgrade that emphasizes accuracy, durability, and repeatable performance. Perfect for precision rifles, tactical systems, or long-range hunting builds, this barrel delivers dependable performance under demanding conditions while maintaining a clean, natural firing experience.