M4E1 Stripped Lower Receiver - Anodized Black

Aero Precision M4E1 Stripped Lower Receiver - Anodized Black

M4E1 Stripped Lower Receiver - Anodized Black Product Sku: APAR600001C
Must Be Shipped to FFL Dealer

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

FFL Terms and Conditions

- Any items placed on the same order as a controlled item will also be shipped to the FFL. If you would like additional items shipped to you directly, please place them on a separate order.

- Please enter your information or the receiving party's (the person that will be picking it up) information under "Recipient Name" while checking out. There will be a seperate field for FFL name, phone and zip code and we will obtain the shipping address directly from them.

- To expedite your order, please have your dealer fax or email their FFL to us. If the dealer you are using to transfer a firearm has not sent us a currently updated FFL to put on file, there will be an extended period of time needed to process your order.

Fax: 253-272-1168 | Email: ffl@aeroprecisionusa.com

There will be a 30% restocking fee on all controlled items returned because of failed background checks.

Federal law requires that you be 21 years or age or older to purchase a stripped receiver or frame. If a frame or receiver can only be made into a long gun (rifle or shotgun), it is still a frame or receiver not a handgun or long gun. However, they still are "firearms" by definition, and subject to the same GCA limitations as any other firearms. See Section 921(a)(3)(b). 18 U.S.C. Section 922(b)(1) makes it unlawful for a licensee to sell any firearm other than a shotgun or rifle to any person under the age of 21.

Made In America? Yes
Platform AR15
Material Machined from 7075-T6 forged aluminum
Finish Anodized Black
Markings "Cal Multi", "M4-" Serial Number Designation
Compatibility Works with standard AR15 components and magazines
Weight(s) 8.61 oz
Other Rear takedown pin detent hole is threaded for a 4-40 set screw. Threaded Bolt Catch Roll Pin (Included).

Customer Reviews

6 Item(s)

Missing bolt catch set screw Review by Forrest
The main reason why i purchased this lower was for the 4-40 roll pin set screw for the bolt catch. Mine was missing straight out of the box. Multiple contacts and no answer, the shipping plus a replacement is $10.58 which i should not have to pay for anyway. (Posted on 6/1/2018)
The sweet spot for quality and price Review by Chris R
The only downside was a bit of leftover machining materials in the front takedown detent hole which has been addressed by Aero. It was easily dug out, performs great and looks slick. I highly recommend. (Posted on 4/10/2018)
Great Product Review by James
I ordered this off another website cause they were having a sale at the time and this is great lower my first time putting one together and everything went without much hassle. Definitely recommend it. (Posted on 2/25/2018)
Not sure I would buy again. Review by ETOH
I have heard a lot of good things about Aero, but this lower didn't seem all that amazing. It does look pretty. I like the threaded bolt catch, rather than a roll pin (black would have been better than silver). I was laughed at by the LOWES guy and was told I would have to go to a specialized nut/bolt place to find the 4-40 set screw (seems odd they don't just include a .25 piece with the lower and a shorter spring the normal spring is too long).
As far as the actual build it was about the same as my others, until the front pivot pin. The spring wouldn't seat properly, only to find out there was a bunch of gritty stuff down in the hole. I got as much out as I could and was able to get the spring to seat, which is good because the spring is now stuck.
Precision- meh
(Posted on 1/31/2018)
Best lower I ever used Review by Mark
Matched this with an M4E1 enhanced upper and fits, works, and looks fantastic! Will use Aero Precision exclusively from now on! (Posted on 1/18/2018)
The Perfect Lower Review by PAR
This is the perfect lower. All the features of billet with the strength and price of a forged lower. Aero amazing quality. Will be getting more of these. Thanks! (Posted on 11/30/2017)

6 Item(s)

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