PROOF RESEARCH pre-fit carbon fiber barrels for Zermatt Arms TL3/SR3, Origin and RimX actions offer precise fitment and fast caliber swaps. These shouldered barrels require no gunsmithing - just thread them in, torque down, confirm headspace and start shooting. Up to 64% lighter compared to traditional steel barrels with a similar contour Enhanced thermal resistance - optimized heat dissipation for cooler and more durable barrels The product exhibits exceptional durability, being encased in high-strength, aerospace-grade carbon fiber that is infused with a proprietary matrix resin 1:7.5 barrel twist rate