The Rise Armament RA6ARCCUBRN18 Complete Upper is a precision-machined upper receiver chambered in 6MM ARC, built around an 18-inch 416R stainless steel barrel with a 1:7 twist rate optimized for long-range ballistic performance. The forged billet aluminum receiver features a rugged Black Cerakote finish that resists wear and corrosion.
This complete upper ships with a free-floating skeletonized aluminum handguard equipped with continuous 12 o’clock Picatinny rail, MLOK slots, four threaded steel sling swivel QD inserts, a snag-free front, and patent-pending attachment lock designed to maintain zero. The RISE ambidextrous charging handle accommodates right- or left-handed operation and works smoothly when wearing gloves or using optics.
Rise Armament’s engineering combines attention to detail with the versatility of the 6mm ARC cartridge to deliver superior accuracy at extended distances. This upper receiver is compatible with standard AR-15 lower receivers, making it a straightforward upgrade for shooters looking to extend their rifle’s long-range capabilities.
