Colt LE6921 Upper Receiver Kit 5.56 NATO 14.5 in

The Colt LE6921 is a complete AR-compatible upper assembly built for reliable, service-grade performance in carbine-length applications. It ships with a bolt carrier assembly and charging handle for a ready-to-install setup on compatible AR lowers. The assembly features a chrome-lined M4-contour barrel and an anodized black finish for durability and routine use.

Key Specifications

• Chambering is .223 Rem / 5.56x45 NATO.
• The barrel measures 14.5 inches and uses a chrome-lined M4 contour.
• The rifling twist is 1:7 right-hand.
• Includes a bolt carrier assembly and charging handle.
• Features a Matech flip-up rear sight.
• The external finish is anodized black.
• Designed to fit AR rifles.
• Product type is a complete upper receiver.
• Includes a pivot pin adapter for Colt lowers with large pivot pins.
• Compatibility note: the included bolt carrier assembly may not work with some Colt rifles equipped with a steel sear block.

This Colt LE6921 upper provides a durable, ready-to-install option for shooters seeking a service-profile AR upper with field-proven components. Its chrome-lined 14.5-inch barrel, matched hardware, and included charging components make it suitable for range work and general carbine applications where a reliable, maintenance-friendly upper is required.