RISE Armament AR-15 18" SS 6mm ARC Assembled Upper Receiver with Free-Float 15" M-LOK Handguard

The RISE Armament® AR-15 18" SS 6mm ARC Assembled Upper Receiver is a factory-assembled performance-ready upper, engineered to deliver impeccable long-range accuracy at a reasonable price point. Built around a forged billet aluminum upper, this assembly provides lasting strength and reliability. It comes paired with a 15" free-float M-LOK handguard featuring a continuous Picatinny top rail and ample M-LOK attachment space, offering plenty of real estate for optics, lights, and other accessories. A patent-pending attachment lock provides optimal rigidity to better maintain your zero. The 18" 416R stainless steel barrel is button-rifled with a 1:7 twist for consistent, precise performance. It's designed for a rifle-length gas system and comes threaded (1/2x28) for fast, frustration-free installation of your favorite flash hider or muzzle brake. To top it off, this upper receiver group ships complete with a charging handle and a premium, MPI-tested bolt carrier group (BCG) featuring a 9310 bolt and a staked gas key. Lifetime warranty.