Product Description The Proof Research PR15 Carbon Fiber AR-Style Barrel in 6mm ARC is built for shooters who demand the best in precision, durability, and weight savings. This 20-inch barrel features a Rifle +1 length gas system and a 1:7.5" twist rate with 4-groove rifling, optimized to stabilize a wide range of 6mm ARC projectiles for exceptional long-range accuracy. The barrel is wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin, reducing weight by up to 64% compared to traditional steel barrels of similar contour. The carbon fiber construction also delivers superior heat dissipation, keeping the barrel cooler and extending its lifespan during sustained fire. A 5/8-24 TPI muzzle thread accommodates a broad selection of suppressors and muzzle devices, while the .750-inch gas block journal ensures compatibility with standard AR-platform components. Whether you are competing on the range, hunting in the backcountry, or building a precision rifle, the PR15 Carbon Fiber Barrel sets the standard for modern AR-platform barrel technology. Product Highlights Up to 64% Lighter: Carbon fiber wrap dramatically reduces weight compared to traditional steel barrels of similar contour, improving maneuverability and reducing shooter fatigue. Superior Heat Dissipation: Aerospace-grade carbon fiber construction provides improved heat dissipation for cooler, longer-lasting performance during sustained or high-volume fire. Aerospace-Grade Carbon Fiber Wrap: Wrapped with high-strength carbon fiber impregnated with a proprietary matrix resin for unprecedented durability, rigidity, and corrosion resistance. 6mm ARC Precision Chambering: 1:7.5" twist rate with 4-groove rifling is optimized for 6mm ARC cartridges, delivering outstanding accuracy at long range. 5/8-24 TPI Muzzle Threading: Ready to accept a wide variety of suppressors and muzzle devices for versatile and user-configurable rifle builds. Specs Brand: Proof Research Model: PR15 Carbon Fiber AR Barrel Series: PR15 MPN: 130438 UPC: 843068130438 Caliber: 6mm ARC Barrel Length: 20" Gas System: Rifle +1 Length Twist Rate: 1:7.5" Grooves: 4 Muzzle Thread: 5/8-24 TPI Gas Block Journal Diameter: .750 in Material: Carbon Fiber / Stainless Steel Finish: Stainless Weight: 2 lbs. 1 oz. Platform Compatibility: AR-15 / PR15 Series 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. ]]>