Caliber swap made simple. PROOF pre-fit carbon barrels for Zermatt TL3/SR3, Origin and RimX thread on in minutes. Torque, check headspace and you're ready to send rounds. 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