Aero Precision M4E1 Stripped Lower Receiver - Anodized Black

Was: $99.99
Now: $84.99
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Stripped Lower


The M4E1 Lower Receiver delivers billet aesthetics in a forged package. This custom designed enhanced forging is machined from 7075-T6 Aluminum and compatible with all mil-spec AR15 parts. Aside from the visual upgrades this custom engineered design provides that challenge much more expensive billet options, we have added several functional features to the lower receiver to simplify the assembly process for the at home builder.

M4E1 Lower Receiver Improvements:

  • 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.


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

35 Reviews Hide Reviews Show Reviews

  • 5

    Posted by John Kinker on Sep 10th 2018

    E amrs is great, fast and always friendly. The m4e1 threaded lower is gorgeous, well worth every cent.

  • 5
    Great lower

    Posted by Russ on Sep 7th 2018

    This was my first build and it went very smooth. Great lower and love that you don't need to use roll pins.

  • 5
    Great Value!

    Posted by Jerry on Aug 27th 2018

    This is a great looking lower with a higher end styling, for an excellent price. The fit, finish, and machining was pristine. I especially like the use of and allen pin for installing the bolt drop paddle; hassle free.

  • 5
    Great Product and Customer Service

    Posted by Jake on Aug 24th 2018

    Great Product and Customer Service

  • 5
    Superior Quality

    Posted by Lonnie on Aug 23rd 2018

    I used to manufacture AR lowers and this lower has everything I wish I would have thought of!

  • 5
    Fantastic Lower

    Posted by Ray on Aug 22nd 2018

    Can't say enough good things about this lower receiver.

  • 5
    Great lower

    Posted by Jose Rosales-Rodarte on Aug 22nd 2018

    Really easy to build especially for a beginner!

  • 5
    Aero lower

    Posted by Saul on Aug 15th 2018

    Awesome lower for builds, great quality. Second build that I've used aero precision and will continue to use for future builds. E-arms was great with price and shipping as well.

  • 5
    M4E1 lower

    Posted by Rambo65 on Aug 6th 2018

    Outstanding fit and finish fast shipping and the customer service is extremely proficient. I will definitely be doing business with them again ☆☆☆☆☆