Not every AR build wants a carbon barrel, and Proof Research's steel PR15 line exists for exactly that shooter. This is an 18-inch 6mm ARC barrel with a .750 gas block journal, ready to drop into a standard AR-15 upper. The 18-inch length is the sweet spot for 6mm ARC, giving the cartridge enough barrel to reach its designed velocity while keeping the rifle handy.

Proof cuts these to the same match-grade standards as its carbon barrels, so accuracy expectations are high. Ideal for a precision gas-gun, coyote rifle or a deer-capable AR-15 build.

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