Product Description The Aero Precision AR-15 Assembled Upper Receiver in Flat Dark Earth (FDE) Cerakote is built for shooters who demand precision and reliability. Manufactured from forged 7075-T6 aluminum and machined to tight Mil-spec M16/M4 tolerances, this flat-top upper features a Picatinny rail for optic-ready versatility. The port door and forward assist are already installed, giving you a solid foundation for your AR-15 build right out of the box. Recognized by military and law enforcement communities nationwide, Aero Precision delivers components that simply work better. Product Highlights Precision machined from forged 7075-T6 aluminum for exceptional strength and durability M4 feed ramps and Mil-spec M16/M4 dimensions ensure reliable feeding and compatibility Flat-top design with Picatinny rail for easy optic and accessory mounting Port door and forward assist pre-installed for a ready-to-build upper assembly Flat Dark Earth Cerakote finish offers corrosion resistance and a tactical aesthetic Specs Brand: Aero Precision MPN: APAR501801AC UPC: 815421020915 Receiver Type: Assembled Flat-Top Upper Receiver Material: Forged 7075-T6 Aluminum Finish: Flat Dark Earth (FDE) Cerakote Rail: Flat-Top Picatinny Rail Feed Ramps: M4 Takedown Pin Holes: .250" Port Door: Installed Forward Assist: Installed Caliber: Multi-Caliber Sights: None (Optic Ready) Dimensions: Mil-spec M16/M4 Note: Requires charging handle, barrel, handguard, gas block, muzzle device, gas tube, and bolt carrier group (BCG) to complete Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>