Aero Precision M4E1 Stripped Lower Receiver - Anodized Black

Was: $99.99
Now: $79.99
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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

17 Reviews Hide Reviews Show Reviews

  • 5
    Nice upgrade over poverty ponies

    Posted by hayley on Jul 19th 2018

    Always great quality from aero, love the little touches on this model. Flared magwell is great but the threaded bolt catch pin and integrated trigger guard save a ton of time and headache in assembly.

  • 5
    You can't go wrong with this Aero Precision lower

    Posted by Thomas on Jul 5th 2018

    This is my second Aero Precision lower... The intergrated oversized trigger guard is a nice plus; no need to bang in a pin. There's also no pin needed to install the bolt release. This lower has a screw, so there's no need to tape up the lower. Two steps that you can skip make it worth the purchase alone. There's also a set screw so you can adjust any slop out of your upper/lower combo. In addition to all those features, it's a good looking piece of metal that will absolutely compliment your build.

  • 5
    High end features, low end price

    Posted by Mike on Jul 4th 2018

    You pay the price of a standard forged lower but get an integrated trigger guard, flared mag well, compatibility with 45 degree safeties, tapped take-down pin detent hole, and upper to lower tensioning screw. This has to be the best value on the market hands down. Fit and finish are perfect on my example and it fits with my existing upper perfectly once I adjusted the tensioning screw just right.

  • 5
    Aero Precision M4E1 stripper lower receiver

    Posted by Robert R on Jul 4th 2018

    Outstanding product and equallly awesome service from Gregg and e-arms. The pricing is outstanding and the selection of quality products is great. Thank you for making buying so easy and painless .

  • 5
    M4E1 is awesome

    Posted by Terry on Jun 21st 2018

    After seeing the M4E1 quality, features and price, my friends wonder why they paid twice as much for something with a fancy name and o picture on the side

  • 5
    Good Product and Experience

    Posted by Unknown on Jun 21st 2018

    I ordered the receiver on Monday and it was delivered to my FFL on Thursday. The lower itself arrived in good condition, with two small blemishes that I can live with. Assembly went smoothly, and the threaded mag catch pin was a surprisingpy useful feature.

  • 3
    Aero Lower is awesome

    Posted by Erik Ishmael on Jun 17th 2018

    Best lower on the market by far (for the price). However it’s definitely a BLEM. I have two obvious places on mine that were touched up. It wasn’t clear I was getting a blem but again, it’s a tool not worried about it.

  • 5
    Great product!

    Posted by Eric L on Jun 15th 2018

    I will definitely be buying from E Arms in the future. Item as described. Fast shipping.

  • 5
    Precision Aero Precision M4E1 Stripped Lower Receiver

    Posted by Paul Cresse on May 15th 2018

    My first Aero purchase, I am very satisfied with my experience shopping with E-Arms. Thank you