Aero Precision M4E1 Builder Set w/ 15″ M-LOK ATLAS S-ONE Handguard – Black

(12 customer reviews)

$346.47 $294.50

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This package deal includes the pieces you need to start building your own M4E1 (AR15) Rifle, including a M4E1 Threaded Upper Receiver, AR15 ATLAS S-ONE 15″ M-LOK Handguard and a M4E1 Stripped Lower Receiver.


  • Aero Precision M4E1 Stripped Lower Receiver
  • Aero Precision M4E1 Threaded Upper Receiver
  • Aero Precision ATLAS S-ONE 15″ M-LOK Handguard
  • All 3 pieces are finished in mil-spec Anodized Black

Additional information

Weight 2.8 lbs
Dimensions 20 × 8 × 4 in

12 reviews for Aero Precision M4E1 Builder Set w/ 15″ M-LOK ATLAS S-ONE Handguard – Black

  1. Brandon L. (verified owner)

    First time purchasing from B. King’s. Great prices and excellent experience. Would definitely recommend doing business with them!

  2. Chad B. (verified owner)

    Great products at great prices, will be a return customer for the next build.
    Thanks B. Kings

  3. Anthony Voss (verified owner)

    Excellent experience purchasing from B.Kings. Definitely earned a repeat customer!

  4. Corey Barkley (verified owner)

    Great product at the best price from a great company, with excellent customer service. Any questions or concerns are answered directly by the owner who takes his time to explain whatever you need, and does seem agitated or bothered by your call, he talks to you like you have been friends for years. Will definitely be dealing with b kings firearms in the future

  5. Zackery Larsen (verified owner)

    Fit and finish is excellent, the Atlas handgaurd is stupid simple to install, lines up well, and is perfect for those with smaller hands or who prefer a small diameter handgaurd. The M4E1 upper and lower look awsome and fit together tightly. Love the increased Maxwell flare and incorporated trigger guard.

  6. uselessfacts (verified owner)

    This is a great set. Lightweight, high quality, great lines. I used this for my new 3 gun rifle. The tube offers a great comfortable grip without extra picatinny to get in the way or add extra weight. The magwell looks good and is functional and the receivers fit together well. B. King took good care of me too, happy I purchased.

  7. Jeremy Burk (verified owner)


  8. Hays C. (verified owner)

    All items arrived at my FFL in a very timely manner. Prices were great. This is my second Aero precision build and couldn’t be happier with the products and services of B. Kings

  9. Anonymous (verified owner)

    Great product, great price, great service

  10. VICENTE M. (verified owner)

    Super fast delivery and product looks better in person than in photos. Couldn’t be more happier. Best deal around!!!

  11. Patrick K. (verified owner)

    Excellent customer service and fast shipping! I will definitely purchase from B. King’s Firearms again. As for the Atlas One build kit, it is super light and great quality.

  12. Terence Hess (verified owner)

    I would order from B King’s Firearms in a heartbeat. He’s no nonsense. No fuss. no muss. The fact that he is a fellow Marine Corps brother is a bonus.

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