The Colt AR-15 Upper Receiver Assembly comes complete with Magpul MOE handguard, charging handle, bolt and bolt carrier assembly. The Colt AR-15 Upper Receiver also comes complete with A2 flash hider 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. The Magpul MOE M-LOK Hand Guard (Magpul Original Equipment) for AR15/M4 rifles combines the light weight of a standard hand guard with modular flexibility. Designed with versatility in mind, M-LOK slots at the two, six, and ten o'clock positions allow the attachment of optional 1913 Picatinny rail sections and other M-LOK accessories for the direct mounting of tactical lights, slings, grips, etc. Reinforced, heat-resistant polymer construction provides operational durability without the weight and expense of an aluminum rail hand guard. Front extensions and lower lip provides additional operato...