Product Description Upgrade your SIG Sauer Cross with the Proof Research Pre-Fit bolt action barrel designed for simple, at-home installation. This carbon fiber-wrapped, drop-in barrel is built to deliver precision performance with reduced weight and excellent heat management, while arriving as a stand-alone, guaranteed-to-headspace solution that eliminates the need to send your rifle to a gunsmith. Chambered in .260 Remington, it features an 18-inch length, a fast 1:8 twist rate with a 5-groove bore, and 5/8"-24 threaded muzzle for easy compatibility with common muzzle devices. Product Highlights Drop-in, pre-fit barrel design for SIG Sauer Crossno gunsmithing required Carbon fiber construction helps reduce weight while maintaining strength and durability 18" barrel length with 1:8 twist rate and 5-groove bore for consistent accuracy 5/8"-24 threaded muzzle supports many popular suppressors and muzzle brakes Guaranteed-to-headspace, stand-alone barrel for straightforward barrel changes at home Specs Brand: PROOF RESEARCH Manufacturer Part Number: 138946 UPC: 843068138946 Product Type: Bolt action pre-fit barrel Fitment: SIG Sauer Cross Caliber: .260 Remington Barrel Length: 18" Twist Rate: 1:8 Bore/Grooves: 5 groove Muzzle Thread: 5/8"-24 TPI Material/Finish: Carbon fiber Barrel Features: Drop-in; guaranteed to headspace 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 products manufacturer.