The Proof Research Proof Bbl Cf Bolt 308win Di 20 Defiance 1-10 delivers a precision-focused rifle barrel designed for serious shooters who demand reliable performance in a 308 Winchester platform, featuring a 20-inch Sendero contour that balances velocity, stiffness, and handling. Built with a carbon steel finish for durability, this barrel pairs a tight 1-10 twist rate with a 5/8-24 muzzle thread to accommodate versatile load development and a wide range of suppressors or muzzle devices. Weighing just 2 pounds 11 ounces, it offers a lightweight upgrade that preserves balance on precision rifles while maintaining the rigidity needed for consistent shot groups. The 20-inch length helps optimize ballistic efficiency for longer-range shots, and the Sendero profile is engineered for stability under rapid fire and extended sessions at the range or field. Ideal for long-range hunting or tactical rifle builds, this barrel from Proof Research integrates seamlessly with established action systems to enhance accuracy, heat resistance, and repeatable performance across demanding shooting conditions.