Rise Armament AR-15 Complete Upper 6mm ARC 18" 1:7 Twist - Black Cerakote

The Rise Armament RA6ARCCUBRN18 is a complete AR-15 upper receiver chambered in 6mm ARC, built around an exceptionally accurate 18-inch 416R stainless steel barrel finished in Black Cerakote.

Designed for precision performance at extended ranges, this upper features a 1:7 twist optimized to stabilize heavier 6mm ARC projectiles. The barrel is threaded 1/2x28 for compatibility with a wide range of standard muzzle devices and is paired with a rifle-length gas system for smooth, reliable cycling with the full spectrum of 6mm ARC factory ammunition.

The upper ships with a 15.25-inch free-float M-LOK handguard machined from aluminum, giving the platform a sturdy, accessory-ready mounting surface and full-length free-float barrel support. M-LOK slots along the handguard accept lights, lasers, grips, bipods, and other accessories directly without removing the handguard.

Drop this complete upper onto any standard mil-spec AR-15 lower to add a hard-hitting 6mm ARC capable rifle to your lineup without sourcing or headspacing individual components. It is well suited for long-range training, predator hunting, and precision AR-15 builds.