Rise Armament RA6ARCCUBLK18 6mm ARC 18" AR-15 Complete Upper Receiver - Black Anodized

The Rise Armament RA6ARCCUBLK18 is a complete AR-15 upper receiver chambered in 6mm ARC, factory-assembled and ready to mate with any mil-spec AR-15 lower receiver.

At the core is an 18" stainless steel barrel with a 1:7 twist, threaded 1/2x28 for standard muzzle device fitment. The barrel is paired with a rifle-length gas system for reliable cycling with 6mm ARC loads.

The black anodized aluminum upper carries a full-length Picatinny rail for optic mounting. An ambidextrous charging handle is included for left- and right-handed use. A 15.25" free-float M-LOK handguard wraps the barrel and provides versatile mounting points for accessories.

Drop the RA6ARCCUBLK18 onto any mil-spec AR-15 lower to complete a 6mm ARC rifle.