Home > Firearm Accessories >

Colt 11.5 inch Monolithic Upper Receiver Assembly
Colt LE6943CK 11.5 inch Monolithic Upper Receiver Assembly

Price: $1,150.00

Stock Status:(Out of Stock)


Colt LE6943 11.5 inch Monolithic Upper Receiver Assembly


The Colt LE6943CK Monolithic Upper Assembly feature's Colt's new monolithic upper receiver. 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 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.

Package Contents

  • Colt LE6943CK Monolithic Complete Upper Assembly
  • Complete M4 Full Auto Bolt Carrier Assembly
  • Charging Handle
  • Backup rear sight
  • Folding Front Sight
  • Manual


  • 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

Suggested Accessories:
Colt Carbine Lower Receiver Assembly
SALE: $500.00

Colt M4 Carbine Lower Receiver Assembly

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 17 Write a review »

  0 of 1 people found the following review helpful:
4 of 5 Fast shipping but item was a bit scratched. January 7, 2021
Reviewer: Anonymous Person from Shhh  
The item came quickly as expected but there were two scratches on the rails that are definitely not supposed to be there. Ordered some touch up paint but was a bit disappointed since the item was new.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 Colt 11.5" Upper Receiver Assembly December 15, 2020
Reviewer: TheColtAR-15Resource.com from KANSAS CITY, MO United States  
The product shipped fast. Unfortunately the box was severely damaged when I received it. Overall another flawless transaction with Arms Unlimited. I recommend them and will buy from them again.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 Colt Upper November 2, 2020
Reviewer: Range Warden from Yuma , AZ United States  
ArmsUnlimited.com service was great.  The Colt upper came in a Colt box with the upper in the factory sealed bag.  It also has the nicer rear sight, not the MagPul sight.   I have ordered guns, and hard to find parts from them in the past and have always been pleased.

Was this review helpful to you?

  1 of 1 people found the following review helpful:
5 of 5 Colt 6943 Monolithic Upper October 28, 2020
Reviewer: Lane F from allentown, PA United States  
Genuine Colt 6943 Upper New in Colt Box, good price in these days of shortage, fast shipping....Arms Unlimited is one of my favorite dealers

Was this review helpful to you?

  1 of 1 people found the following review helpful:
5 of 5 There is a QD Sling Swivel Hidden in the Box! September 23, 2020
Reviewer: PT from Lakeway, TX United States  
It's a brand spanking new monolithic with Colt "C" and Brass Aluminum Forging Enterprises forge marks (Square). Fastest shipping in the business and came in a Colt box (for some that seems to matter). Colt charging handle and BCG are included along with Magpul rear BUIS. I threw that away and put on a MaTech with a Forward Control Designs Retrofit Kit. Be careful and do not throw away the box too quickly! There's a QD sling swivel hiding in there! There are a lot of 11.5's from different manufacturers for sale out there, which obviously are not Colt...so it was a no brainer for me.

Was this review helpful to you?

View All Customer Reviews