Colt 14.5 inch Upper Receiver Assembly w/ KAC RAS Quad Rail


Colt LE6921DOS 14.5 inch Upper Receiver Assembly w/ KAC RAS Quad Rail


The Colt LE6921DOS-CK Upper Receiver Assembly was built for Department of State and feature’s Colt’s upper receiver and Knight’s Armament’s RAS 7″ Quad Rail. In addition to an uninterrupted full-length front rail, this upper receiver allows for a free-floated barrel. This LE6921CK Upper Assembly also features a gas-block mounted fixed front sight post with bayonet lug. The barrel is Colt’s standard 14.5″ chrome lined M4 barrel with an A2 flash hider up front. 

Package Contents

  • Colt LE6921CK Complete Upper Assembly
  • Complete M4 Full Auto Bolt Carrier Assembly
  • Knights Armament RAS 7″ Quad Rail
  • Charging Handle
  • Fixed Post Front Sight
  • Manual


  • 14.5 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
  • High strength materials for greater comfort and effectiveness
  • Caliber – 5.56mm
  • Gas Direct system, Locking bolt
  • Front Sight – Adjustable front
  • Flash Hider


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