Description
Colt LE6921 5.56 NATO 14.5" Complete Upper Receiver Group
Bring battle-proven reliability to your AR-15 lower with the Colt LE6921 Complete Upper Receiver Assembly (MPN: LE6921CK). As the gold standard for duty, law enforcement, and military operations worldwide, this authentic Colt factory-assembled upper receiver group offers the legendary durability and precise manufacturing required for absolute performance under pressure.
This complete upper features a 14.5-inch chrome-lined barrel with a 1:7" twist rate, precisely engineered to handle and stabilize heavy defensive and military-grade 5.56x45mm NATO ammunition. Built with a traditional carbine-length gas system, standard front sight base (FSB), and classic polymer M4 handguards, this setup delivers a time-tested, high-reliability platform.
The receiver group comes fully equipped and ready for action right out of the box. It includes an authentic Colt Mil-Spec M16 profile Bolt Carrier Group (BCG), charging handle, and a Magpul MBUS flip-up rear sight, making it a true drop-in upgrade for any standard mil-spec AR-15 lower receiver.
(Note: Because this barrel is 14.5 inches long, all NFA rules apply if pinned to a standard rifle lower receiver without permanently attaching a muzzle device to meet the 16" minimum legal length.)
Key Features
-
Legendary Colt Reliability: Built to strict military and law enforcement standards using premium, factory-tested components.
-
Chrome-Lined Barrel: Designed to withstand high-volume firing while resisting corrosion and maximizing barrel life.
-
Complete Drop-In Package: Includes an authentic Colt M16 bolt carrier group, charging handle, and Magpul rear sight so it's ready to pin and shoot.
-
Mil-Spec Construction: Perfect for duty use, clone builds, or high-performance training configurations.
