Colt LE6921 | 5.56 NATO | 14.5in Chrome-Lined Upper

The Colt LE6921 is a factory complete AR-style upper assembly built for use in .223 Rem and 5.56 NATO platforms. It ships with a bolt carrier assembly and charging handle and features a 14.5-inch chrome-lined, M4-contour barrel with a 1:7 right-hand twist. The unit includes a flip-up rear sight and hardware that make it suitable for standard AR carbine builds and for range training or marksmanship practice. Construction and finish are aimed at long-term durability in routine use.

Product Specifications

• The manufacturer is Colt.
• The model is LE6921.
• The caliber is .223 Rem / 5.56 NATO.
• The barrel is a 14.5-inch chrome-lined M4-contour with a 1:7 right-hand twist.
• The assembly includes a bolt carrier assembly and charging handle.
• The sighting system includes a flip-up rear sight.
• The finish is anodized black.
• Included accessories contain a bayonet lug and screw-on flash hider.
• The package also includes a pivot pin adapter to fit Colt lowers with large pivot pins.
• The intended fit is AR-style rifles.
• The product is supplied as a complete upper receiver assembly.
• The included bolt carrier assembly is current production and may not be compatible with some Colt rifles equipped with a steel sear block.
• UPC: 098289035325.

This Colt LE6921 upper offers a factory-configured starting point for building or repairing an AR-style carbine where a 14.5-inch chrome-lined barrel and standard M4 contour are desired. It arrives with core operating components and sighting hardware so it can be integrated into a compatible lower for range work, training, or general-purpose AR builds. The combination of a chrome-lined bore and a 1:7 twist makes it suitable for a broad range of bullet weights commonly used in .223/5.56 platforms.