The M5 .308 Win Complete Lower Receiver is the ultimate foundation for building your custom big-bore AR rifle. Precision-engineered for strength and reliability, this lower receiver ensures seamless compatibility and top-tier performance. Get a hassle-free head start purchasing it fully assembled means our expert gunsmiths handle the installation, so you can focus on what matters most customization and performance. Save time and money without compromising on quality build your dream rifle with confidence, starting with the M5 .308 Win Complete Lower Receiver.

Works seamlessly with standard AR .308 Win components and magazines
Rear takedown pin detent hole is threaded for a #4-40 set screw, allowing customization
Bolt catch is threaded for a screw pin, eliminating the need for a roll pin and simplifying assembly
The integrated trigger guard enhances durability and protection while providing a seamless, ergonomic design for improved handling and control
Selector markings are designed to work seamlessly with 45, 60 or 90 deg safety selectors for user preference
Accepts Battle Arms Development short throw safety selectors while maintaining compatibility with standard selectors
No gap with aftermarket pistol grips ensures a seamless and ergonomic fit for improved handling
This kit includes everything needed to complete your lower assembly, Aero Precision M5 lower receiver, A2 grip, lower parts kit, receiver extension, .308 carbine buffer and spring
These precision-engineered parts are expertly installed to ensure optimal firearm performance and reliability
This complete lower receiver is sold without a stock, allowing users to customize their build to fit their specific shooting needs

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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).