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Aero Precision
Overview
The Aero Precision M4a1 Clone Lower Receiver is a stripped lower designed for the AR-15 platform, ready for you to build your custom rifle. It is compatible with the 5.56 NATO caliber and features a trigger pin diameter of .154, making it a versatile choice for various trigger options. This lower receiver commonly appears in builds utilizing a mid-length gas system, providing a balanced shooting experience.
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Aero Precision M4A1 Clone Lower Receiver ranked #14 of the 507 lower receivers builders added on GunPartPicker in August 2026, behind the Spike's Tactical Spikes Tactical Upper/Lower Receiver .223 Remington AR Lower, Flat Dark Earth - STS1512, with about 2% of all lower receivers added to builds. That's its 2nd straight month at #14. Builds with this lower receiver are mostly chambered in 5.56 NATO (83%, then 300 Blackout 11%), mostly on mid-length gas (73%, then carbine-length 13%), and nearly all AR-15.
It was hard to find in August 2026, in stock on only 6 of the 17 days we checked, and today none of the 4 retailers we track has it in stock right now. It dipped to $111.87 at Brownells for a stretch in August 2026, well under its usual $129.99, so sales do come around. Listed prices start at $129.99 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 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 →The part most often added in each category by the 570 builds that include this one
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Aero Precision M4a1 Clone Lower Receiver
| Build | Parts | Total |
|---|---|---|
 | 12 | $641.19 |
 | 12 | $960.82 |
 | 14 | $1017.45 |
 | 22 | $2266.54 |
| 17 | $798.40 |
 | 12 | $3097.83 |
| 31 | $2788.05 |
| 26 | $1746.84 |
 | 14 | $2283.17 |
 | 27 | $2294.81 |
| 30 | $5059.51 |
| 20 | $969.88 |
7 global ratings
Top reviews
Aero Precision M4A1 clone lower fits tight to a M4 spec upper with no detectable play at the takedown pin lugs. Cerakote colt gray is consistent. Authentic M4A1 markings are clean. Solid base for an authentic-style clone build.
Aero M4A1 clone lower mates perfectly with my BCM upper. Authentic M4A1 markings on the magwell are sharp. Cerakote colt gray is consistent. Standard mil-spec dimensions accept any parts kit. Solid clone build base.
Aero Precision M4A1 clone lower has the cerakote in colt gray. Cerakote is slightly thicker than expected which made the initial mate to my upper tight - eased after a few cycles. Authentic M4A1 markings are nicely applied.
Aero M4A1 clone lower exceeds expectations for the price. Authentic M4A1 markings on the magwell. Cerakote colt gray is consistent. Recommend it for any clone build. Standard mil-spec dimensions accept all parts kits.
Aero Precision M4A1 clone lower has anodize that varies slightly from my Aero upper in direct light. Mate is tight at the takedown pins with no rattle. Quality forging. Authentic M4A1 markings are sharp.
aero M4A1 clone lower with the correct markings for a clone build. tolerances are tight against an aero upper, takedown pins slip with thumb pressure. anodize is even across the receiver
Aero M4A1 clone lower is better than I expected for the price. Authentic M4A1 markings are sharp. Cerakote colt gray is consistent. Standard milspec dimensions. Mate to my BCM upper has minimal play. Recommend for clone builds.
