Proof Research 130438 AR-Style Barrel 6mm ARC 20 in Rifle +1 Length Gas System 1:7.5 in Twist 4 Groovest 5/8-24 tpit Carbon Fiber Wrapped

Overview

The Proof Research AR-style barrel is chambered in 6mm ARC with a 20-inch length. It is constructed from match-grade 416R stainless steel, cut-rifled, and hand-lapped for consistency. The barrel is turned down to a reduced contour and wrapped in aerospace-grade carbon fiber impregnated with a proprietary matrix resin, which significantly reduces weight and improves heat dissipation compared to traditional steel barrels. This barrel features a 1:7.5-inch twist rate, 4 grooves, and a rifle+1 length gas system. The muzzle is threaded 5/8-24 TPI for accessory attachment.

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