Colt LE6940CK upper receiver conversion kit chambered for .223 Rem/5.56 NATO featuring a monolithic Picatinny top rail, free-floated chrome-lined button-rifled barrel, and a built-in flip-up front sight.
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.
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.
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