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Colt
Overview
The Colt M4 LE6921ERP Upper Group is a complete assembly designed for the AR-15 platform, featuring a 14.5-inch barrel with a twist rate of 1:7, making it well-suited for stabilizing a range of bullet weights while ensuring optimal performance with 5.56 NATO caliber ammunition. This upper receiver is ideal for builders looking to create a compact and versatile rifle that balances maneuverability with effective range. It frequently appears in builds focused on the 5.56 NATO caliber, catering to those who prioritize reliability and accuracy in their firearms.
Specifications
Available Merchants(4)
Prices checked
Stock Alert
September 2026 on GunPartPicker
Colt M4 LE6921ERP Upper Group 14.5in With BCG ranked #267 of the 615 upper receivers builders added on GunPartPicker in September 2026.
It was hard to find in September 2026, in stock on only 14 of the 24 days we checked, and today none of the 4 retailers we track has it in stock right now. Prices barely moved in September 2026, holding around $994.99, so there haven't been real sales lately. Listed prices start at $886.99 at KY Gun Company for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
Colt M4 Commando 5.56mm Semi-Auto Lower Receiver Assembly With "LE" Prefix
PSA AR-15 Bolt Carrier Group 5.56 Full-Auto Nitride MPI - 516446953
Bravo Company Manufacturing Gunfighter Charging Handle 556 Mod 3B - Large Latch
Bravo Company Manufacturing BCMGUNFIGHTER Short Vertical Grip - KeyMod - Flat Dark Earth
Daniel Defense Collapsible Mil-Spec Buttstock, Brown - 21-091-04179-011
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