PROOF RESEARCH carbon pre-fits for Zermatt TL3, SR3, Origin and RimX actions are easy to install - just thread, torque, check headspace and go. Upgrade or change calibers quickly and confidently. 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 Barrel twist rate - 1:8