This DPMS Low Profile Flat-Top AR-15 Stripped Upper Receiver is constructed of Extruded 7029 T6 Aluminum and given a Hard Coat Anodized Finish for durability. The upper comes equipped with a Flat-Top Picatinny Rail that can accommodate the broad spectrum of modern sighting arrangements, including any number of rear iron sights, red dot sights, or rifle scopes. The Low Profile Upper is a "Slickside" design that lacks a brass deflector and has no provision for adding a forward assist or ejection port door, creating a sleek, smooth profile devoid of all protrusions and potential snag points. Stripped upper does not include any internal parts. Includes M4 feed ramps.