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Colt
Overview
The Colt M4 Commando 5.56mm Semi-Auto Lower Receiver Assembly is a complete lower receiver designed specifically for the AR-15 platform. It accommodates the 5.56 NATO caliber, making it ideal for a variety of applications, from tactical to recreational shooting. This lower receiver is a common choice for builds that utilize a carbine gas system, offering builders a reliable foundation for their AR-15 projects.
Colt M4 Commando 5.56mm Semi-Auto Lower Receiver Assembly With "LE" Prefix ranked #38 of the 507 lower receivers builders added on GunPartPicker in August 2026, behind the Yankee Hill Machine .223 Rem/5.56 Billet Lower Receiver, Hardcoat Anodized Matte Black - 125-BILLET, with about 1 in every 250 lower receivers added to builds. Down from #22 in July. Builds with this lower receiver are mostly chambered in 5.56 NATO (81%, then .223 Wylde 12%), split between carbine-length (58%) and mid-length (31%) gas systems, and nearly all AR-15.
Updated · from real builds on GunPartPicker
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:
The part most often added in each category by the 188 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 Colt M4 Commando 5.56mm Semi-Auto Lower Receiver Assembly With "LE" Prefix
| Build | Parts | Total |
|---|---|---|
 | 5 | $3293.83 |
 | 9 | $4431.55 |
 | 21 | $2141.65 |
 | 7 | $2140.96 |
 | 7 | $1858.99 |
 | 19 | $9433.05 |
 | 20 | $3400.01 |
 | 29 | $5371.37 |
 | 8 | $1811.14 |
2 global ratings
Top reviews
Colt M4 Commando 5.56 lower assembly with LE prefix is the law enforcement marking. Mil-spec parts kit installed. Authentic Colt markings. Standard mil-spec dimensions throughout. Drops in to any milspec upper without fitting.
LE prefix lower is a collector item at this point, mated to a colt upper for a retro 6920 build. tolerances are exactly what youd expect from colt, takedown pin slip without play but no rattle either. trigger pocket clean
