Proof Research made its name wrapping match-grade steel barrels in carbon fiber, cutting weight dramatically while improving heat dissipation and stiffness. This PR15 barrel brings that technology to the AR-15 platform in 6mm ARC, the Hornady cartridge that turned the AR-15 into a legitimate long-range rifle. At 18 inches with a .750-inch gas block journal, it is a natural fit for precision gas-gun builds aimed at matches or open-country hunting. Proof barrels are button-rifled, hand-lapped, and held to exacting tolerances, which is why they show up on so many competition rifles and lightweight mountain builds.

In stock and ready to ship straight to your door from Dawson Defense, an Arizona-owned licensed dealer.