Product Description The Proof Research 134481 Bolt Action Barrel Pre-Fit is a precision-engineered, carbon fiber drop-in replacement barrel designed specifically for the Sig Sauer Cross rifle. Chambered in .308 Winchester and measuring 20 inches in length, this barrel features a 1:10" twist rate with 5-groove rifling and a 5/8"-24 TPI threaded muzzle for suppressor or muzzle device compatibility. The drop-in pre-fit design allows for a stand-alone, guaranteed-to-headspace installation right at home with no gunsmith required. Wrapped in aerospace-grade carbon fiber impregnated with a proprietary matrix resin over a match-grade steel core, this barrel delivers unmatched lightweight performance and superior heat management, making it an ideal upgrade for hunters, long-range shooters, and precision rifle enthusiasts. Product Highlights Drop-in pre-fit design engineered specifically for the Sig Sauer Cross -- guaranteed to headspace with no gunsmith required Up to 64% lighter than traditional steel barrels of similar contour, significantly reducing overall rifle weight Extreme temperature-resistance with improved heat dissipation for cooler, longer-lasting barrel performance during extended shooting sessions High-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin for unparalleled durability and rigidity Chambered in .308 Winchester with a 1:10" twist rate (5-groove rifling) and 5/8"-24 TPI threaded muzzle for broad muzzle device compatibility Specs Brand: Proof Research MPN: 134481 UPC: 843068134481 Caliber / Cartridge: .308 Winchester Barrel Length: 20" Twist Rate: 1:10" Grooves: 5 Muzzle Threads: 5/8"-24 TPI Material: Aerospace-Grade Carbon Fiber with Proprietary Matrix Resin Fit: Sig Sauer Cross Design: Drop-In Pre-Fit Weight: 3.09 lbs Quantity: 1 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. ]]>