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 price
The improved forging process imparts a "billet look" to the upper receiver
The new picatinny profile integrates seamlessly with Aero Precision's enhanced and Atlas series handguards
M4 feed ramps
0.250 inches takedown pin holes
Incorporates a threaded forward assist roll pin
Incorporates a port cover and a forward assist mechanism
M4E1 threaded upper receiver in Magpul FDE Cerakote
Port door and forward assist have been installed

Report incorrect product description

Reviews

Q & A

Retail Stock

Compliance

Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).