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Aero Precision
Overview
The Aero Precision M4E1 Lower Receiver is a complete assembly designed for the AR-15 platform, featuring a trigger pin size of .154, which is compatible with most standard triggers. This lower is finished in a hardcoat anodized black, ensuring durability and a sleek appearance. It is optimized for the 5.56 NATO caliber, making it a solid choice for builds that focus on a mid-length gas system, commonly seen in versatile applications ranging from recreational shooting to tactical scenarios.
Aero Precision M4E1 Lower Complete W/ MOE SL Grip & SL Stock
Aero Precision M4E1 Lower Complete W/ MOE SL Grip & SL Stock ranked #23 of the 507 lower receivers builders added on GunPartPicker in August 2026, behind the Radian Weapons ADAC-15 Stripped Lower Receiver - Gray, .223 Remington/5.56x45mm, Premium Quality for Reliable and Accurate AR Builds - R0388, with about 1 in every 125 lower receivers added to builds. Up from #29 in July. Builds with this lower receiver are mostly chambered in 5.56 NATO (67%, then 300 Blackout 14%), split between mid-length (50%) and carbine-length (28%) gas systems, and nearly all AR-15.
It was out of stock everywhere we track for all of August 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $212.99 at KY Gun Company for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 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 Lower Complete W/ Moe Sl Grip & Sl Stock
| Build | Parts | Total |
|---|---|---|
 | 14 | $2072.00 |
 | 26 | $3057.61 |
 | 10 | $811.34 |
 | 9 | $1108.87 |
 | 12 | $1108.09 |
 | 13 | $1751.71 |
 | 5 | $854.42 |
| 8 | $2658.09 |
| 16 | $2856.57 |
 | 14 | $4039.75 |
 | 6 | $1565.98 |
| 13 | $2905.72 |
2 global ratings
Top reviews
Aero Precision M4E1 complete lower with MOE SL grip and stock drops in to a standard upper without fitting. Anodize matches Aero uppers exactly. Trigger is milspec but easily replaceable. Standard mil-spec dimensions throughout.
aero M4E1 complete with MOE-SL grip and stock makes the build a 2 minute job to mate with an upper. threads on the buffer tube are clean, mag well opening is sized for any standard mag. saves the LPK build time which is the appeal
