The stylization of the YHM-110-BILLET was directly related to the stylization of the Billet lower which YHM finished first. It is crafted from 7075-T6 aluminum and has a hardcoat anodized matte black finish. It features M4-style feed ramps and the inside is coated with dry film lube. It accepts standard upper receiver parts and mil-spec lower receivers. *Note- Requires a dust cover, forward assist, charging handle, barrel, handguard, gas block, muzzle device, gas tube and BCG (Bolt Carrier Group) to complete. Type Stripped Series Upper Receiver Sights Optic Ready Caliber 5.56x45mm NATO Handguard Finish Black Receiver Description 7075-T6 Aluminum M4