Aero Precision M4E1 Pistol Complete Lower Receiver with SBA3 Brace

Manufactured by Aero Precision
SKU: APAR600146
MPN: APAR600146
Manufactured by Aero Precision
2 Reviews

Out of Stock

NOTE: Limit 3 per household. Quantities exceeding 3 will not allow checkout.

Items that are regulated by the ATF have restrictions and requirements:
•Your entire order will ship only to a Federal Firearm License holder.
•Current processing time is approximately 14 to 16 days.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to
•If this firearm includes magazines with a capacity higher than 10 rounds it may not be legal in your state. We will review all order prior to shipping and if your state does not allow the included magazines they will be removed.



Get a rock solid start to your next pistol build with the Aero Precision M4E1 complete pistol lower! This factory-finished lower is ready to roll with a Magpul MOE SL pistol grip and adjustable SB Tactical SBA3 pistol arm brace. With high quality components and fantastic quality of life features, this complete AR-15 lower is a fantastic shortcut to your next finished rifle!

  • Adjustable SB Tactical SBA3 pistol arm brace
  • Compatible with standard AR-15 magazines
  • Nylon tipped tensioning set screw
  • Threaded bolt catch roll pin (included)
  • Machined from 7075-T6 forged aluminum
  • Anodized black
  • Rear takedown pin detent hole is threaded for a 4-40 set screw

A threaded takedown pin detent recess allows easy installation of the takedown pin detent and spring with the use of a 4-40 set screw. Increased magwell flare aids in quick and efficient magazine changes. Marked and milled to accept short-throw safety selectors, but will work with standard selectors as well. To really elevate this complete lower, it's been equipped with the SBA3 adjustable arm brace from SB Tactical, allowing for length of pull adjustments for an optimal fit with almost any shooter.

Aero Precision is known for superior engineering and machining. They push the boundaries of manufacturing and challenge the status quo by constantly looking for new ways to develop and evolve.
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AssemblyComplete Assemblies
BrandAero Precision
Caliber MarkingMulti-Caliber
FinishHardcoat Anodized
Receiver Material7075-T6 Aluminum
Trigger Pin DiameterMIL-SPEC .154

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

2 reviews

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Highly recommend

by -

Durable, lightweight and great workmanship.

Very good- I can overlook the trigger

by -

This is a nice lower. The M4E1 look is sleek, and I love the straight-line billet aesthetics. The SBA3 brace looks good on anything- That thing is a visual masterpiece. I thought it looked a bit “toy-ish” in pictures, but in real life it’s clearly a quality product.
<br>The trigger is somewhat heavy and it’s only single-stage. Unless you really like heavy, single-stage triggers, or just don’t give a darn, you’ll probably want to trade it out.
<br>I’m using this as a base for a self defense / SHTF pistol and I couldn’t be much happier. I personally think that the M4E1 is as good as it gets when it comes to duty-ready, no-problem lowers.