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Colt LE6943CK Monolithic Complete Upper Receivers 11.5" Bbl

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5.00 LBS

Out Of Stock


The Colt LE6943CK Monolithic Upper Assembly feature's Colt's law enforcement fully unitized URG.  In addition to an uninterrupted full-length front rail, this upper receiver allows for a free-floated barrel. This LE6943CK Monolithic Upper Assembly also features a gas-block mounted front flip-up sight with bayonet lug and a flip-up rear sight. The barrel is Colt's standard 11.5" chrome lined M4 barrel with an A2 flash hider up front.

A unique and outstanding feature is the folding front sight. Unlike many folding front sights, the Colt folding front sight base is pinned in place as opposed to screwed on. Now, there is an advantage and a disadvantage to screwing in place.  Both A.R.M.S. and PRI offer a front site base with set screws that allow changes for extreme windage.  But, Colt has pinned the front sight base, and we like that as being more durable and permanent. Due to the pinning process, the front sight base will not loosen and adversely affect accuracy or reliability. The benefit of the folding front sight is noticeable when using optics. The standard front sight base can interfere with the view of optics when mounted on the rail of a flat top upper receiver, and the operator has an improved field of view with the front sight folded. Most optics as well will allow co-witnessing between the back-up sights and the optic in case the battery was to fail, or the optic was to become damaged. The front sight base is equipped with a bayonet lug. The Colt folding front sight is robust and positive locking. 


  • 11.5-Inch 1/7 twist Mil-Spec chrome lined MP tested barrel
  • Unique direct gas operating system eliminates the conventional operating rod and results in fewer and lighter components
  • Accommodates the full range of 5.56mm ammunition, including the NATO M855/SS109 and U.S. M193, utilizing a rifling twist of 1 turn in 7"
  • Straight-line construction disperses recoil straight back to the shoulder, increasing handling capabilities, especially during repeated fire
  • Cartridge case deflector allows easy operation in both right and left handed shooting positions for increased tactical applications
  • Muzzle compensator further reduces muzzle climb and helps eliminate flash and dust signatures
  • Ejection port cover protects the chamber from dust and mud
  • Field strips easily without special tools for simple field user maintenance
  • Flat top receiver allows for removable carrying handle and easy mounting of accessories
  • Target style rear sight features dual apertures (0-200m, 300-600m) and adjusts for both windage and elevation
  • High strength materials for greater comfort and effectiveness
  • Caliber - 5.56mm
  • Gas Direct system, Locking bolt
  • Front Sight - Adjustable front
  • Rear Sight - Target sight adjustable for windage and elevation
  • Flash Hider


  • Colt LE6943CK Monolithic Complete Upper Assembly
  • Complete M4 Full Auto Bolt Carrier Assembly
  • Charging Handle
  • Backup rear sight
  • Folding Front Sight
  • no factory box included

WARNING This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to You must be 18+ years old to shop and or purchase on our website and 21+ to purchase Ammunition/Firearms. Check local laws before ordering as you certify you are of legal age and satisfy all federal, state, and local legal/regulatory requirements. There are NO returns or exchanges on armor, firearms, ammunition, PPE equipment. Ammo ships UPS ground to the lower 48 states.
We reserve the right to fix any critical errors.

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Additional Information

Complete Upper Assemblies
Barrel Length:
Made In USA
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2 Reviews

  • 5

    probably the best Colt upper

    Posted by Surgicaltool on 17th Sep 2022

    Absolutely love it. Mine came with factory box, manual, muzzle cover, QD swivel. You’ll need some rail covers due to the sharp edges. It has a slightly higher recoil impulse than a rifle length upper but not bad, better than my BCM 11.5. Markings are C stamped upper, nothing on the barrel, C on carrier and unmarked bolt. I was a little disappointed but not surprised at the lack of bolt markings. This upper is more right and handles heat better than anything I have seen, has some nice aluminum heat shields, upper is completely 7075 aluminum (obviously monolithic so no way it can rotate in the slightest). Flip up sight is a nice touch and has a magpul back up sight.

  • 5

    Colt through and through

    Posted by Samuel Hays on 14th Jun 2022

    Grab these while you still can, you will not be disappointed. Colt will always be the leader in value.

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