The M4E1 Lower Receiver combines the sleek aesthetics of billet construction with the durability and reliability of a forged package. Machined from high-quality 7075-T6 Aluminum, this custom-engineered receiver is fully compatible with all Mil-Spec AR-15 parts, offering both style and function. Beyond its striking visual appeal, the M4E1 is designed with performance in mind, incorporating features that rival higher-end billet receivers while streamlining the assembly process for at-home builders. Whether you're a seasoned enthusiast or a first-time builder, the M4E1 provides an exceptional foundation for your custom AR-15 project.

The threaded bolt catch roll pin simplifies installation and minimizes the risk of finish damage during assembly, requiring a 1/16 Inches hex key for setup
The integrated trigger guard eliminates the risk of breaking trigger guard tabs by seamlessly incorporating it into the lower receiver, creating a stronger, more rigid platform for durability and customization
Upper tension screw fine-tunes the upper and lower receiver fit with a nylon-tipped tensioning set screw, inserted in the grip tang for enhanced stability
This component ensures a secure and precise fit with any standard AR-15 upper receiver, optimizing reliability and performance
The threaded takedown pin detent recess allows for easy installation of the takedown pin detent and spring using a #4-40 set screw, eliminating the hassle of lost detents
The magwell flare has been increased to facilitate quick and efficient magazine changes
The stripped M4E1 lower receiver includes a nylon-tipped tensioning set screw and a threaded bolt catch pin for enhanced fit and durability

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If you live in California, please read this notice before ordering.

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.

Magazines will be removed from firearms when shipping to states with magazine capacity restrictions.

Must be 21 or older to purchase.

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 Stripped Lower, OD Green