PROOF Research pre-fit carbon & steel barrels for Zermatt Arms TL3/SR3 Origin and RimX actions make it easy to upgrade your rifle or change calibers. Our pre-fit Zermatt Arms shouldered barrels are easy to install. Simply thread it on torque it down double check headspace and head for the range. – DISCLAIMER: – * All shouldered pre-fit barrels are guaranteed for headspacing. – * Due to variance in actions we do not guarantee the timing and alignment of the barrel engraving to your stock line. – * Barrels are specific to the action type/length and are not interchangeable. – Lightweight: Up to 64% lighter than traditional steel barrels of similar contour. – Extreme Temperature Resistance: Improved heat dissipation for cooler and longer lasting barrels. – Unprecedented Durability: Wrapped with high-strength aerospace-grade carbon fiber impregnated with a proprietary matrix resin.