The Geissele Assembled Upper comes built with a dust cover and a forward assist. Featuring M4 feedramps and precision machined to mil-spec standard, the Geissele Assembled Upper is ready to be finished in your desired configuration. In order to complete this Assembled Upper, you will need the following: - Charging Handle - Bolt Carrier Group - Rail/Handguard - Barrel - Muzzle Device - Sights - Optic and Optic Mount Shipping available.