The M4E1 threaded upper receiver introduces a bold new angular machined design that sets it apart from typical mil-spec upper receivers. It features the same enhanced body profile as our M4E1 Enhanced Upper Receiver but is uniquely threaded to accept a standard AR-15 barrel nut. Constructed from durable 7075-T6 aluminum, it is precision machined to seamlessly integrate with all mil-spec AR-15 components. This upper receiver comes complete with the port door and forward assist pre-installed for easy assembly. Designed to pair perfectly with our M4E1 Lower Receiver, the M4E1 threaded upper receiver offers the premium aesthetic of a billet receiver set at a more accessible price, providing exceptional performance and value.

Features an enhanced forging that gives the upper receiver a billet look for improved aesthetics
Has a new picatinny profile that blends seamlessly with the enhanced and Atlas series handguards for a streamlined look and performance
M4 feedramps are included to ensure reliable feeding of ammunition
The set features 3/4 inches takedown pin holes for precise fitment
Features laser-engraved t-marks for precise and clear markings
The package includes a threaded forward assist roll pin for secure assembly
The package includes a port door and a forward assist for smoother operation of the firearm

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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).

Aero Precision M4E1 Threaded Assembled Upper Receiver, OD Green