Aero Precision M4E1 Stripped Lower Receiver – Black


Aero Precision M4E1 Stripped Lower Receiver – Black


Aero Precision’s flagship M4E1 Lower Receiver delivers billet aesthetics in a 7075-T6 forged aluminum package.

Its custom design is immediately recognizable and synonymous with a quality lower receiver, forming the keystone of your brand new AR15 build. Visual upgrades aside, this custom engineered design is compatible with typical milspec AR15 parts, however, also has baked-in upgrades aimed at simplify the assembly process for the at home builder.

Don’t forget to add a lower parts kit!

What’s in the box?

  • Stripped M4E1 Lower Receiver
  • Nylon tipped tensioning set screw
  • Threaded Bolt Catch Pin

Note: Enjoy!

Heads up! This item must be shipped to an FFL or picked up at Penn Armory by a buyer at least 21 years of age. You will have the option to enter the name of your FFL during checkout. Please have your FFL send an email with a copy of their license and your name/order number to Your order will ship immediately following the confirmation of your FFL.


Availability: Out of stock SKU: APAR600001C Categories: , , , , , , , , ,


Why choose M4E1 over a standard mil-spec lower receiver?

Aesthetics aside, the M4E1 is one of the staples of a modern AR15. Aero Precision has removed some of the most cumbersome tasks with AR-platform building and baked the improvements into its flagship lower receiver.

  • Threaded Bolt Catch Roll Pin – Allows for simple installation of the bolt catch and virtually eliminates the chance to damage the finish during installation (pin included). 1/16″ Hex Key required for assembly.
  • Integrated Trigger Guard – Eliminates the possibility of breaking the trigger guard tabs by integrating the trigger guard into the lower, creating a stronger more rigid platform to build upon.
  • Upper Tension Screw – Allows users to fine tune the fit of the upper and lower receiver using a nylon tipped tensioning set screw inserted in the grip tang of the lower receiver. This provides a tight fit with any standard AR15 upper receiver.
  • Threaded Takedown Pin Detent Recess – Allows user to easily install the Takedown Pin detent and spring with the use of a 4-40 set screw (no more launching detents across the room).
  • Increased Magwell Flare – Increased the flare of the magwell to aid in quick and efficient magazine changes.
  • Marked and milled to accept short-throw safety selectors, but will work with standard selectors as well.

Additional information


Aero Precision


.223 Remington, 5.56×45 NATO



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