PROOF Savage Pre-Fit carbon fiber barrels are available in select calibers, lengths, twist rates and come in a standard straight taper contour. Your barrel will arrive threaded and chambered for an easy install - just spin them on, set the headspace with gauges, and tension the barrel nut. *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. *Fits Savage Small Shank Actions Mfg: Proof Research