The Colt AR-15 Upper Receiver Assembly comes with A2 flash hider, Centurion CMR M-Lok Handguard, and a barrel with a black parkerized finish. This Upper Receiver Assembly comes with a picatinny-style flattop rail for plenty of accessories, and is more than ready to offer maximum versatility. FeaturesA2 Flash HiderCenturion CMR M-Lok HandguardBlack Parkerized Barrel Finish