Rise Armament 6 ARC Complete Upper Receiver, 18" Stainless Steel Barrel, Black Anodized - RA6ARCCUBLK18

This is a Rise Armament complete upper receiver chambered in 6mm ARC with an 18" stainless steel barrel featuring a 1:7 twist rate and 1/2x28 thread pitch. The upper includes a 15.25" free-float M-LOK handguard, rifle-length gas system, black nitride bolt carrier group, ambidextrous charging handle, and anodized black finish. This is a complete, ready-to-assemble upper for AR-15 platform rifles requiring only a lower receiver to complete the rifle.