Proof Research 101292 AR-Style Barrel 308 Win 20″ Black Carbon Fiber Finish 416R Stainless Steel Material Rifle Length with Threading & .875″ Gas Journal Diameter for AR-Platform

Overview

The Proof Research AR-style 308 Win barrel is a 20-inch rifle-length match-grade barrel featuring a 1:10-inch twist rate, 5 grooves, and a 5/8-24 tpi threaded muzzle. It begins as a full-profile 416R stainless steel barrel blank that is turned down and wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin from PROOF Research ACD. This carbon fiber wrapping provides a specific strength up to 30 times that of stainless steel and a specific stiffness up to 7 times greater, resulting in a barrel up to 64% lighter than traditional steel contours. The helical wrapping pattern optimizes longitudinal thermal diffusivity to dissipate heat efficiently, keeping the barrel cooler during high-volume fire, preventing point-of-impact shift, reducing harmonic vibration, and maintaining match-grade accuracy in demanding environments.

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