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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 ranks #27 of the 512 lower receivers builders have added on GunPartPicker so far in November 2026, behind the Wilson Combat AR-10 Stripped Lower Receiver Anodized Black, with about 1 in every 167 lower receivers added to builds. Up from #55 in October. Builds with this lower receiver are mostly chambered in 5.56 NATO (85%, then .223 Wylde 9%), split between carbine-length (44%) 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:
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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 | $3368.91 |
 | 9 | $4459.55 |
 | 21 | $2114.43 |
 | 7 | $2000.97 |
 | 7 | $1877.47 |
 | 19 | $5834.21 |
 | 20 | $3169.82 |
 | 29 | $5215.98 |
 | 8 | $1750.13 |
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
