The Aero Precision M4A1 Clone Lower Receiver (part no. APAR148018C) is a stripped Gen 2 lower chambered for .223 Remington/5.56 NATO and finished with custom engraving to replicate the look of a period-correct M4A1 build. The markings include a Property of U.S.A. MOD M4 CARBINE CAL. 5.56MM stamp, a serial number designation, and cosmetic Safe/Semi/Auto selector markings that mirror authentic military-style receivers for an accurate clone appearance. Functionally, this receiver is a standard semi-automatic-only civilian AR-15 lower; the retro markings are cosmetic engraving only and do not add or enable any additional firing mode. This variant does not carry the A-designation engraving on the magwell. It ships stripped, ready for the lower parts kit, buffer, and stock of your choosing.

Key Specifications

• Chambered for .223 Remington/5.56 NATO AR-15 pattern uppers.
• Built on Aero Precision’s Gen 2 lower receiver platform.
• Features custom retro engraving replicating an M4A1-style build.
• Includes a serial number designation and Property of U.S.A. markings for an authentic look.
• Semi-automatic only, with cosmetic Safe/Semi/Auto selector markings for appearance.
• Includes a nylon-tipped tensioning set screw to reduce upper/lower play.
• Ships as a stripped receiver, ready for your lower parts kit and stock.
• Machined from 7075-T6 aluminum to Aero’s Gen 2 receiver specification.
• Weighs approximately 0.7 pounds bare.

Frequently Asked Questions

Does the Auto marking mean this fires automatically? No. The selector markings are cosmetic engraving that replicate a period-correct look; the receiver functions as a standard semi-automatic-only civilian lower.

What is the A-marking difference? This variant does not include the additional engraving on the magwell that other M4A1 clone lowers carry.

Does this lower ship complete? No, it ships stripped and requires a lower parts kit, buffer, and stock to finish the build.

Buy the Aero Precision M4A1 Clone Lower Receiver

Build an authentic-looking clone on a Aero Precision receiver. Browse more AR-15 lower receivers and order from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.