Wilson's Forged Upper Receiver is a M4 Mil-Spec, flat-top upper receiver precision CNC machined from 7075-T6 aluminum forgings for maximum durability and Mil-Spec Type 3 hard coat anodized in rugged black. Whether you are building a match upper or a complete tactical rifle, quality starts with the upper receiver. This receiver comes unmarked for a clean, custom look. NOTE: Requires a dust cover, forward assist, charging handle, barrel, handguard, gas block, muzzle device, gas tube and BCG (Bolt Carrier Group) to complete.