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
    Dont bother looking at any other lowers.

    Posted by Unknown on May 27th 2019

    This is a very high quality lower. Lines and is very solid. I will be using this lower for any future builds.

  • 5
    Grant Gildner

    Posted by Grant Gildner on Mar 31st 2019

    Great fit and finish. Functioned flawlessly. Looks fantastic

  • 5
    Aero M4E1

    Posted by Bud on Mar 13th 2019

    An amazing product while still a reasonableprice. Love the bolt catch being a allen key instead of a annoying pin as well as the trigger guard. All my builds use these

  • 5
    Aero M4E1 lower

    Posted by Jason on Sep 24th 2018

    Great deal, cheapest price I have found in Aero products!

  • 5
    Aero Precision M4E1 lower

    Posted by walterjas on Sep 19th 2018

    The nicest forged lower period . The nicest lower period . E-arms has the best $ & fast shipping . I never had to contact customer service , but I bet that is the best also !

  • 5

    Posted by BBB on Sep 18th 2018

    Fit and finish are great. Still waiting on parts, so build is not yet complete. Tolerances are very tight.

  • 5
    Awesome Lower for the Price!!

    Posted by Kyle on Sep 17th 2018

    Picked one of these M4E1s on sale for $60 shipped and it did not disappoint! Fit and finish is great even though FedEx decided to absolutely crush the exterior and interior packaging. The screw in bolt catch screw was floating around in the lower bag so be careful not to lose that when you open it. One day these will be back to triple this price so get them while you can!

  • 5
    Doesn't get any better than this...

    Posted by John on Sep 13th 2018

    For the price this lower is unbeatable. Let me first just say that E-Arms is awesome, their prices are amazing and shipping is lightning quick. I'm glad I got recommended to them. Onto the lower; it looks great, feels great, the machining and surface finish are top notch. I can't say enough good things about Aero and their products and they've never disappointed. The threaded bolt-catch 'pin' makes this thing worth it alone, the icing on the cake (to me at least) is the modestly flared magwell, low-cut trigger guard and the adjustable lower to upper receiver fit screw. My rifle went together easily and the fit is amazing, zero wiggle or play with my Aero slickside upper. Do yourself a favor and get one of these, you won't regret it!

  • 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.