Description
The LE6940 came out of Colt's law enforcement line back in 2009, and it fixed the two things people were changing on the LE6920 anyway: the handguard and the sights. Instead of a separate quad rail bolted onto a flat top, Colt machined the upper receiver and rail system as one continuous piece. That means the top rail runs unbroken from the rear of the receiver all the way to the front sight, and the barrel underneath is genuinely free-floated. Pull an optic off, put it back on, and your zero stays put. That kind of repeatability is what separates this rifle from a standard carbine wearing an aftermarket rail.
What Makes the LE6940 Different
The barrel is Colt's 16.1 inch chrome-lined M4 profile tube with a 1:7 twist, so it stabilizes everything from light varmint loads to heavy 77 grain match ammo. An A2 flash hider caps the muzzle, and the direct impingement gas system runs the same proven parts as the rest of the M4 family. Colt's folding front sight is pinned to the gas block rather than screwed on, so it stays locked in place, and when it's folded down you get a completely clear sight picture through a red dot or scope. A Magpul MBUS handles rear backup duty. The lower rail section is removable if you want to slim things down or mount accessories underneath.
A Duty Rifle Through and Through
At around 6.8 pounds unloaded with a 4-position collapsible stock, the LE6940 carries and points like a patrol rifle should. It was built for agency contracts, and everything about it reflects that: mil-spec construction, a chrome-lined bore that shrugs off neglect, and rails at 12, 3, 6, and 9 o'clock for lights, lasers, and grips.
Why the Colt 6940 Still Holds Its Own
Plenty of monolithic uppers on the market are two pieces welded together. Colt's is the real deal, machined as one unit, and it has become something of a modern classic among Colt collectors and working rifles alike. If you want prancing pony rollmarks with a free-float barrel and zero gunsmithing required, this is the one.
Key Specifications
- Manufacturer: Colt
- Model / MPN: LE6940
- UPC: 098289019349
- Caliber: .223 Rem / 5.56x45mm NATO
- Action: Semi-Auto, Direct Gas Impingement
- Barrel Length: 16.1 in, Chrome-Lined M4 Profile
- Twist Rate: 1:7 RH, 6 Grooves
- Upper Receiver: One-Piece Monolithic with Free-Float Barrel
- Muzzle Device: A2 Flash Hider
- Sights: Pinned Folding Front, Magpul MBUS Rear
- Stock: 4-Position Collapsible
- Overall Length: 32 in Collapsed / 35.5 in Extended
- Weight: 6.79 lb Unloaded
- Capacity: 20+1
- Finish: Matte Black Anodized
What’s Included
- Colt LE6940 carbine
- One 20-round magazine
- Magpul MBUS rear sight (installed)
- Owner's manual
Frequently Asked Questions
What's the difference between the Colt LE6940 and the LE6920?
The big one is the upper receiver. The LE6920 uses a standard flat top with drop-in handguards and a fixed front sight base, while the LE6940 has a one-piece monolithic upper with a continuous top rail and a free-floated barrel. The 6940 also swaps the fixed front sight for a pinned folding unit, which clears the view through mounted optics.
Is the LE6940's monolithic upper really one piece?
Yes, and that matters. A lot of so-called monolithic uppers are two sections welded or joined together, but Colt machines this receiver and rail as a single unit. The result is a stiffer platform where optics can come off and go back on without losing zero, and the barrel floats freely underneath for better accuracy.
What ammo does the Colt LE6940 shoot best?
The 1:7 twist chrome-lined barrel is about as versatile as it gets in 5.56. It handles heavy 69 to 77 grain match loads especially well, and it runs standard 55 grain and 62 grain ball ammo without a hiccup. Since it's chambered in 5.56 NATO, it safely fires both 5.56 and .223 Remington.
Can I mount a scope or red dot without losing my iron sights?
Absolutely, that's one of the LE6940's best tricks. The front sight folds flat against the gas block and the Magpul MBUS rear folds down too, giving your optic a completely unobstructed field of view. If your optic ever goes down, both sights flip up in a second and you're back in business.





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