The Colt LE6921 Complete Upper (brand part no. LE6921CK) is a factory Colt upper chambered in .223 Rem/5.56 NATO, built around a 14.5-inch barrel and finished with a flip-up rear sight for immediate use without a separate optic. Colt builds the LE6921 to the same standard as its law enforcement and military-pattern carbine uppers, giving builders a way to add genuine Colt fit and function to a personal lower without buying a complete rifle. Shipping as a complete assembly rather than a parts kit, it mounts straight onto a compatible AR-15 lower.

Key Specifications

• Chambered in .223 Rem/5.56 NATO.
• Barrel measures 14.5 inches.
• Equipped with a flip-up rear sight.
• Ships as a complete upper assembly.
• Built to genuine Colt fit and function standards.

Frequently Asked Questions

Does this include sights? Yes, it ships with a flip-up rear sight installed.

Is this a complete upper? Yes, it’s a complete, ready-to-mount upper assembly.

Buy the Colt LE6921 Complete Upper, 14.5in

Add genuine Colt fit and function to your build. Order the Colt upper from our AR15 uppers selection at our Lubbock, Texas gun shop for fast, direct shipping.