PROOF Research pre-fit carbon barrels for Zermatt Arms Origin actions make it easy to upgrade your rifle or change calibers. Proof 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. *Carbon Fiber barels are 64% lighter than traditional Steel barrels. *Improved heat Dissipation for cooler and longer lasting barrels. *Wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin. Barrels are specific to the action type/length and are not interchangeable. Mfg: Proof Research