Colt LE6940CK Upper Receiver | 5.56 NATO | Black

The Colt LE6940CK upper receiver assembly is a complete conversion kit that integrates a continuous Picatinny top rail into a rigid monolithic design for stable optics mounting and consistent alignment. It uses a free-floated barrel system intended to reduce external pressure on the barrel and support consistent accuracy. The barrel is described as chrome-lined and button rifled with a 1-7 twist, and the upper includes a built-in flip-up front sight compatible with standard-height rear sights.

Product Specifications

• Manufacturer: Colt.
• Model: LE6940CK.
• Product type: Upper receiver conversion kit / complete upper group.
• Cartridge: .223 REM/5.56 NATO.
• Finish: Anodized.
• Color: Black.
• Platform: AR-15.
• Rail: Monolithic continuous Picatinny top rail for rigid optics mounting.
• Barrel design: Free-floated barrel to reduce external pressure on the barrel.
• Barrel treatment: Chrome-lined, button-rifled.
• Barrel twist: 1-7 twist as stated in the product description.
• Iron sight: Built-in flip-up front sight compatible with standard-height rear sights.
• Included components: Complete upper group (advertised with BCG and sights in product naming).
• Style: Complete.
• UPC: 098289035288.

This upper is suitable for range use and competitive or precision-oriented AR-15 builds where a rigid rail and a free-floated, chrome-lined barrel are priorities. Its monolithic top rail simplifies optic mounting and alignment while the built-in front sight provides a reliable iron-sight option for co-witness or backup use.