Product Description The PROOF Research PR15 Carbon Fiber Wrapped Rifle Barrel in 22 ARC is a precision-engineered barrel built for the AR-15 platform that merges the strength of stainless steel with the weight-saving advantages of carbon fiber technology. At 20 inches in length with a rifle-length gas system, this barrel delivers a smooth and consistent shot cycle while keeping the overall rifle build lightweight and balanced. A 1:7 inch twist rate is optimized to stabilize the 22 ARC cartridge for maximum accuracy at extended ranges, while the 5/8x24 threaded muzzle allows for easy attachment of suppressors or muzzle devices. With a standard contour profile and .750 inch gas block journal diameter, this barrel is a drop-in upgrade for any serious AR-15 build. Product Highlights Carbon fiber wrapped stainless steel construction dramatically reduces weight without sacrificing rigidity or precision Chambered in 22 ARC with a 1:7 inch twist rate engineered for optimal bullet stabilization and downrange performance 20-inch rifle-length barrel with a 5/8x24 threaded muzzle for suppressor or muzzle device compatibility Standard .750 inch diameter at the gas block journal accommodates most low-profile gas blocks Rifle-length gas system promotes smoother cycling, reduced felt recoil, and improved overall reliability Specs Brand: PROOF Research Model: AR-Style Barrel (PR15) Caliber: 22 ARC Barrel Length: 20" Barrel Type: Rifle Length Twist Rate: 1:7" Thread Pattern: 5/8"x24 Gas Block Journal Diameter: .750" Material: Stainless Steel Core / Carbon Fiber Wrap Profile: Standard MPN: 143483 UPC: 843068143483 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. ]]>