Colt LE6943 Upper (LE6943CK)

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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