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Aero Precision
Overview
The Aero Precision M4E1 Complete Lower Receiver comes fully assembled and ready to integrate into your AR-15 build. Constructed from durable 7075-T6 aluminum, it features a hardcoat anodized finish for enhanced resistance to wear and corrosion. With a trigger pin diameter of .154 inches, this lower receiver is compatible with standard trigger components and is designed for use with the 5.56 NATO caliber, making it a solid choice for a variety of configurations, particularly those utilizing a mid-length gas system.
Aero Precision M4E1 Complete Lower Receiver W/MOE SL Grip & SL-S Carbine Stock
Aero Precision M4E1 Complete Lower Receiver W/MOE SL Grip & SL-S Carbine Stock ranked #34 of the 477 lower receivers builders added on GunPartPicker in September 2026, behind the Wilson Combat AR-10 Stripped Lower Receiver Anodized Black, with about 1 in every 250 lower receivers added to builds. Down from #3 in August. Builds with this lower receiver are mostly chambered in 5.56 NATO (81%, then .223 Wylde 10%), split between mid-length (60%) and carbine-length (24%) gas systems, and nearly all AR-15.
It was out of stock everywhere we track for all of September 2026, and today none of the 3 retailers we track has it in stock right now. Listed prices start at $233.99 at KY Gun Company for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
We ranked every lower receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Lower Receiver Trends →Check it against the live catalog:
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Aero Precision M4e1 Complete Lower Receiver W/moe Sl Grip & Sl-S Carbine Stock
| Build | Parts | Total |
|---|---|---|
 | 5 | $1961.47 |
 | 14 | $2948.59 |
 | 8 | $1831.62 |
 | 16 | $4612.26 |
| 25 | $1784.42 |
| 10 | $3841.43 |
 | 6 | $993.07 |
| 13 | $1146.99 |
 | 9 | $1484.09 |
 | 6 | $1306.53 |
 | 8 | $2608.70 |
| 15 | $4069.36 |
2 global ratings
Top reviews
M4E1 complete from Aero with the MOE SL grip and SL-S stock is the easy mode of starting a build. Everything is in spec, takedown pins detent correctly. Anodize matches my Aero upper exactly. Trigger is a basic milspec but you can drop in any aftermarket trigger easily.
complete aero lower with MOE-SL grip and stock pre installed. saves the LPK build step. tolerances against an aero upper are tight, takedown pins slip with thumb pressure. integrated trigger guard is the standard aero touch
