Aero Precision M4E1 Threaded Assembled Upper Receiver w/Semi-Cut, Black

The M4E1 upper receiver redefines the standard with its distinctive angular machined design, offering a modern aesthetic that distinguishes it from conventional mil-spec upper receivers. Retaining the enhanced body profile of Aero's M4E1 enhanced upper receiver, this model is engineered to accommodate a standard AR-15 barrel nut, providing versatility and ease of customization. Constructed from robust 7075-T6 aluminum, it ensures durability and reliability, while precision machining guarantees seamless compatibility with all mil-spec AR-15 components. For added convenience, the upper receiver comes with the port door and forward assist pre-installed, streamlining the assembly process and enhancing operational readiness.Set at a fraction of the billet's priceThe improved forging process imparts a "billet look" to the upper receiverThe new picatinny profile integrates seamlessly with Aero Precision's enhanced and Atlas series handguardsM4 feed ramps0.250 inches takedown pin holesIncorporates a threaded forward assist roll pinIncorporates a port cover and a forward assist mechanismM4E1 threaded upper receiver in Magpul FDE CerakotePort door and forward assist have been installed