Product Description The PROOF Research PR-10 AR-10 Barrel in .308 Winchester is built for shooters who refuse to compromise on accuracy or reliability. Crafted from premium stainless steel, this 18-inch barrel is purpose-designed for AR-10 platform rifles and delivers the match-grade performance PROOF Research is recognized for worldwide. A rifle-length gas system ensures smooth, consistent cycling, while the 5/8-24 threaded muzzle readily accepts flash hiders, suppressors, muzzle brakes, and other popular muzzle devices. With a 1:10 twist rate optimized for .308 Winchester ammunition and a .750-inch gas journal diameter compatible with standard gas blocks, this barrel is the ideal foundation for a precision-driven rifle build. Product Highlights Premium stainless steel construction delivers superior corrosion resistance and long-lasting durability under demanding conditions 18-inch barrel with rifle-length gas system for optimized muzzle velocity and smooth, reliable cycling 1:10 twist rate engineered for match-grade consistency and accuracy with .308 Winchester ammunition 5/8-24 threaded muzzle provides broad compatibility with suppressors, flash hiders, muzzle brakes, and more .750-inch gas journal diameter ensures drop-in compatibility with standard AR-10 gas blocks Specs Brand: PROOF RESEARCH Model: PR-10 MPN: 100677 UPC: 843068100677 Caliber: .308 Winchester Barrel Length: 18 inches Twist Rate: 1:10 Gas System Length: Rifle Gas Journal Diameter: .750 inches Muzzle Thread: 5/8-24 Material: Stainless Steel Finish: Stainless Weight: 3 lbs 1 oz Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>