Proof Research Pre-Fit Barrel Features The Proof Research Pre-Fit Barrel starts with a full-profile match-grade 416R stainless steel barrel blank made in-house which is then turned down to a significantly reduced contour to cut weight before the carbon fiber wrap is applied. That carbon fiber layer is impregnated with a proprietary matrix resin developed by Proof Research s advanced composites division giving the barrel strength that matches a traditional steel barrel of much heavier profile. The carbon fibers diffuse heat along the length of the barrel and move heat through the barrel wall more effectively than steel alone which keeps the barrel cooler during strings of fire. This reduces the accuracy-robbing effects of heat over long range sessions and extends the usable life of the barrel. Chambered in 6mm Creedmoor with an 18 inch length and a 1 in 7.5 inch twist rate this pre-fit barrel is built to stabilize the longer higher ballistic coefficient bullets favored for extended range shooting. A 5/8x24 threaded muzzle accepts a suppressor or muzzle device without additional gunsmithing. Finished in a stainless carbon fiber exterior and weighing 2 lb 8 oz the barrel is a direct drop-in fit for the Sig Sauer Cross action. This pairing of reduced weight and improved heat management makes the Proof Research Pre-Fit Barrel a practical upgrade for Sig Cross shooters chasing lighter rifle weight and more consistent accuracy for sale at GrabAGun. Proof Research Pre-Fit Barrel Specifications Manufacturer: Proof Research Model: Pre-Fit Barrel Type: Rifle Barrel Compatible Hosts: Sig Sauer Cross Caliber: 6mm Creedmoor Barrel Length: 18 Twist Rate: 1-in-7.5 Finish: Stainless Material: Carbon Fiber Muzzle Threads: 5/8x24 Weight: 2 lbs 8 oz Available At: GrabAGun