Aero Precision AR15 M4E1 Stripped Lower – Black

Rated 4.91 out of 5 based on 55 customer ratings
(55 customer reviews)

$99.99 $79.99

100 in stock


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.


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

Additional information

Weight 1 lbs
Dimensions 10 × 6 × 2 in

55 reviews for Aero Precision AR15 M4E1 Stripped Lower – Black

  1. Rated 4 out of 5

    Anonymous (verified owner)

    Pretty straightforward transaction. I bought an AR lower at a good price and they shipped it to my FFL. That’s how it’s supposed to work.

  2. Rated 5 out of 5

    ROBERT (verified owner)

    As advertized – upper and lower fit and finish are top notch

  3. Rated 5 out of 5

    Anonymous (verified owner)


  4. Rated 5 out of 5

    Patrick (verified owner)

    Great price for the product I wanted, will definitely purchase from B. King in the future when possible.

  5. Rated 5 out of 5

    Thomas Koehler (verified owner)

    Quality Aero Precision as always. Service is even better! Thank you Blake for all your help. This is the best one stop shop for your AR build. Keep up the great service.

  6. Rated 5 out of 5

    brian p. (verified owner)

    Fastest turnaround for cerakoting and had the lowest price out of 5 (mostly local) coaters near me. My questions and concerns were responded to right away by King himself. Will definitely come back for my next build.

  7. Rated 5 out of 5

    David Kutina (verified owner)

    Received the AeroM4E1 lower and assembled it on their 458 SOCOM upper. Had zero problems doing so, the screw for the bolt catch made it worry free ,no scratches . The adjustment screw to take the play out between the upper and the lower is also a big plus, no loose shims to deal with . I really like this lower and your prices and service are the best. Regards, Dave

  8. Rated 5 out of 5

    Josh (verified owner)

    excellent customer service

  9. Rated 5 out of 5

    Anonymous (verified owner)

    best prices around and a great product!

  10. Rated 4 out of 5

    Rudolph (verified owner)

    Fit and finish is great. I had one issue during assembly the front pivot pin spring hole was half full of what appeared to be media from media blasting. The wholesaler had nothing to do with this as it was a new packaged lower. is great to work with and when I’m in the market again they’ll be at the top of the list.

    • blake king

      This is becoming a common issue with the M4E1 Lowers, once cleaned out it works just fine. This issue has been reported to Aero Precision.

  11. Rated 5 out of 5

    DAVID MCMULLEN (verified owner)

    Easy to deal with, fast service, would easily do again!

  12. Rated 5 out of 5

    Anonymous (verified owner)

    Good price and shipped fast.

  13. Rated 4 out of 5

    Ryan (verified owner)

    First time doing business with Bkings, won’t be the last. Great prices and excellent customer service! Wish the upper/lower receiver fit was a little more snug. If it weren’t for that this would be a five star review.

  14. Rated 4 out of 5

    kenneth Linklater (verified owner)

    Arrived in a timely manner with a great price! Thanks B.King’s Firearms 😉

  15. Rated 5 out of 5

    Joseph Austin (verified owner)

    Shipped as soon as it arrived. Looks awesome. Really appreciate the service.

  16. Rated 5 out of 5

    Victor M. (verified owner)

    Great communication

  17. Rated 5 out of 5

    Joshua Mills (verified owner)

    This is my favorite lower I have

  18. Rated 5 out of 5

    Rodney Parker (verified owner)

    IMO the best engineered, feature rich forged lower on the market today, regardless of price.

  19. Rated 4 out of 5

    Anonymous (verified owner)

    FFL documentation was processed quickly and I got the receiver within a week. Product itself has good fit and finish, works as advertised by Aero Precision. The only thing preventing a perfect score is that the recess for the pivot pen detent was filled with aluminum shavings. It’s not a major issue, I could get it all out with a drill bit, and Aero tells me that they are working with their anodizer to solve this, but it’s still something I’d prefer not to see on a “premium” lower with enhanced features. Also, while I greatly appreciate the 4-40 set screw threading for the takedown pin detent recess, it’s just a bit annoying that Aero doesn’t ship a 4-40 set screw with the receiver.

    • blake king

      The 4-40 threaded pin is supposed to be in the lower when shipped, sometimes they throw the pin loose in the box and its in one of the corners.

  20. Rated 5 out of 5

    James O. (verified owner)

    Great response time and fast shipping. Great products.

  21. Rated 5 out of 5

    Jeremy (verified owner)

    Fast shipping. Excellent Value. Quick to respond to emails and questions. Will continue to buy from Blake

  22. Rated 5 out of 5

    Andre King (verified owner)

    Great first time experience

  23. Rated 5 out of 5

    Brian L. (verified owner)

    Best price on this lower. Great service.

  24. Rated 5 out of 5

    Keith (verified owner)

    Great purchase on this AR lower!!! Thanks!

  25. Rated 5 out of 5

    Anonymous (verified owner)

    Incredible Price, Super Fast shipping. A+

  26. Rated 5 out of 5

    Earl R. (verified owner)


  27. Rated 5 out of 5

    Terry V. (verified owner)

    Great deal! Received it quickly and it’s just what I expected.

  28. Rated 5 out of 5

    William P. (verified owner)

    Best pricing on the M4E1 stripped lower and fast shipping! B King’s Firearms is my go to for all my AR needs…….

  29. Rated 5 out of 5

    Anonymous (verified owner)

    Very good service and price.

  30. Rated 5 out of 5

    Anonymous (verified owner)

    Great quality lower

  31. Rated 5 out of 5

    Brandon K. (verified owner)

    solid, quality part with great machining. This was my first purchase at B. King’s; it was nice and smooth and l I’ve already got two more orders on the way.

  32. Rated 5 out of 5

    Chris (verified owner)

    Great price and fast shipping

  33. Rated 5 out of 5

    Robert (verified owner)

    Good customer service.

  34. Rated 5 out of 5

    William B. (verified owner)

    Couldn’t be happier with service & product & price. Shipping was immediate. Actually like this forged Aero Precision receiver better than the last billet one (different manufacturer). King’s was aces through the whole process.

  35. Rated 5 out of 5

    Danny H. (verified owner)

    Great product. Very well made and thought out

  36. Rated 5 out of 5

    Joseph (verified owner)

    Good price, quick shipping, lowers arrived in good condition.

  37. Rated 5 out of 5

    Ryan (verified owner)

    Best forged lower on the market.

  38. Rated 5 out of 5

    John England (verified owner)

    Aero Precision has exceeded my expectations on not only their lower receivers, but any of their products that I have purchased. The threaded lowers are a breeze to assemble, even for the novice builder. And you will have a finished product that has no damage to the finish due to trying to drive irritating roll pins. The tension screw is a great feature and helps with an awesome fitting upper/lower receiver set. My opinion is the Aero matches the finish and fit quality of brands that are twice as expensive. I’ve built three on the Aero Precision brand and will certainly go back with them on any future projects. I would highly recommend Aero Precision, and BKing’s Firearms. Com, to anyone looking for high quality products at an affordable price.

  39. Rated 5 out of 5

    Jeffery Dunn (verified owner)


  40. Rated 5 out of 5

    Alton Jones (verified owner)

    Excellent communication, and on of the nicest lowers I have ever had.

  41. Rated 5 out of 5

    John M. (verified owner)


  42. Rated 5 out of 5

    Timothy Burton (verified owner)

    As usual BKings has great stock, good prices and prompt shipping. Only problem is this causes them to get a lot of my money. Haha. The M4e1 lowers are awesome for builds. Thanks to Blake and crew!!

  43. Rated 5 out of 5

    Bradley A. (verified owner)


  44. Rated 5 out of 5

    James D B. (verified owner)

    Nice lower.

  45. Rated 5 out of 5

    Anonymous (verified owner)

    Nice quality lower. Love the screw for the bolt release.

  46. Rated 5 out of 5

    ojcjunior (verified owner)

    First purchase and it went smooth as butter. He even answered my emails extremely fast! Already made my second purchase and I know it will be perfect as well

  47. Rated 5 out of 5

    Bradley A. (verified owner)


  48. Rated 5 out of 5

    Jjwassel (verified owner)

    Absolutely beautiful lower from Aero Precision. These are my go to for AR builds. I can’t believe the price on the website either, nearly impossible to beat. Shipping said it would take 6 days to arrive and showed up in 3. Bkingsfirearms is now my favorite spot on the internet.

  49. Rated 5 out of 5

    Anonymous (verified owner)

    This lower is a very good quality lower. I used the Aero lower parts kit and everything works properly and fits properly

  50. Rated 5 out of 5

    JOSHUA WASSEL (verified owner)

    Awesome machine work. These are my go to lowers for builds along with the matching uppers. Cannot beat the quality and finish for the money. Best prices on the internet on this site. Said it would arrive in 6 days, took 3. I will definitely be shopping here again

  51. Rated 5 out of 5

    Jeremy C. (verified owner)

    Quality product super fast shipping !

  52. Rated 5 out of 5

    blind9026 (verified owner)

    Fast shipping and easy transaction. My local FFL is garbage here in Florida but these guys took care of me. Cerakoting is perfect and the M4E1 lower is a quality piece. Thanks B.King!

  53. Rated 5 out of 5

    Franklin O. (verified owner)

    Best lowers for the money–can’t go wrong. Great price and fast shipping.

  54. Rated 5 out of 5

    Angel N. (verified owner)

    First time using them and had a great experience. Part was as expected and they answered all my questions fast.

  55. Rated 5 out of 5

    Jerry H. (verified owner)

    Shipped very fast!

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