What Are the Specs of the LE6920 (M4 Carbine) by Colt?
Woody's answers are based on published federal and state law. Not legal advice. Consult a licensed attorney for your specific situation.
The Colt LE6920 is a 5.56 NATO AR-15 carbine with a 16.1-inch chrome-lined barrel, 1:7 twist rate, carbine-length gas system, full-auto BCG, and weighs 6.9 pounds unloaded with an overall length of 32-35.5 inches.
How This Affects Your Build
The LE6920 represents Colt's law enforcement carbine offering, built to military specifications with proven components. This rifle serves as a benchmark for understanding what constitutes a proper M4-style carbine configuration. For builders studying authentic military specifications, the LE6920 provides a reference point for component selection and overall build philosophy.
The Detail
The LE6920's barrel specifications define its performance characteristics. The 16.1-inch chrome-lined, chrome-moly vanadium barrel features a 1:7 right-hand twist rate optimized for heavier 5.56 NATO projectiles. This twist rate stabilizes bullets ranging from 55 grains up to 77 grains effectively, making it versatile for various ammunition types. The chrome lining provides enhanced durability and corrosion resistance compared to bare steel.
The gas system configuration uses carbine-length measurements, creating a specific timing relationship between the bullet leaving the barrel and gas pressure cycling the action. This carbine-length system runs at higher pressures than mid-length alternatives, contributing to reliable cycling with a wide range of ammunition weights and loads. The system feeds into a full-auto bolt carrier group, which provides additional mass compared to semi-auto carriers.
Colt equips the LE6920 with traditional M4 furniture including the M4 double-heat-shield carbine handguard and A2 flash hider. The handguard design provides heat protection during sustained firing while maintaining the classic M4 profile. The mil-spec lower receiver accepts standard AR-15 components and features the A2 pistol grip configuration.
Weight and dimensional specifications show the rifle weighs 6.9 pounds unloaded with an overall length ranging from 32.0 inches collapsed to 35.5 inches with the stock extended. These measurements reflect the standard M4 carbine proportions that balance maneuverability with effective barrel length for 5.56 NATO performance.
Build Impact
If you're building an M4 clone or want proven specifications, the LE6920 specs provide a tested baseline configuration. The 1:7 twist rate and carbine gas system combination offers reliable function, though you might consider mid-length gas systems for smoother operation in custom builds.