Aero Precision M4E1 Assembled Upper Receiver – AR-15 Platform

The Aero Precision M4E1 Assembled Upper Receiver is designed for AR-15 pattern builds in 5.56 NATO/.223 Remington. Features a forged 7075-T6 aluminum construction with an integrated M4 feed ramp extension and forward assist, compatible with mil-spec AR-15 lowers. The M4E1's enhanced design includes a squared-off upper receiver profile and continuous Picatinny rail, simplifying handguard installation.

Finished in Type III hard-coat anodized black for corrosion resistance. Upper is fully assembled with ejection port door and forward assist installed. Does not include bolt carrier group, charging handle, or handguard. Requires standard AR-15 barrel nut and handguard to complete assembly. No gunsmithing required for installation on mil-spec lower receivers.

• Caliber: 5.56 NATO/.223 Remington
• Type: Assembled upper receiver (no BCG/CH)
• Compatible Lower: Mil-spec AR-15
• Material: Forged 7075-T6 aluminum
• Finish: Type III hard-coat anodized black
• Includes: Assembled upper with ejection port door and forward assist
• Installation: Requires barrel, barrel nut, handguard, BCG, and charging handle