Colt M4 Upper 5.56 16.1" Blk

The Colt M4 Upper 5.56 16.1" Black (SKU CTLE6920CK) is a combat-proven upper receiver assembly built on Colt's legacy of manufacturing reliability. Featuring a 16.1-inch barrel optimized for 5.56 NATO/.223 Remington and equipped with an A2 fixed front sight, this upper delivers the accuracy and durability demanded by law enforcement, military units, and serious carbine operators. The platform accepts standard M4-pattern components, making it a versatile choice for duty rifles, patrol carbines, and modular AR systems.

The 16.1-inch barrel length provides a practical balance between velocity retention and handling characteristics—maintaining sufficient energy downrange while keeping overall length manageable in vehicle and entry scenarios. The A2 fixed front sight offers fast target acquisition without requiring additional mounting solutions. At 5.31 lbs, the upper contributes minimal weight to the complete carbine, preserving balance and reducing operator fatigue during extended operations. This configuration is favored for close-quarters duty work, where sight radius and barrel length are optimized for typical engagement distances under 100 meters.

Operators in patrol, tactical, and training environments rely on Colt uppers for consistent performance across thousands of rounds. The build quality ensures minimal tolerance stack and repeatable accuracy, critical when duty demands reliability under stress. Whether completing a rifle build, replacing a worn upper, or maintaining standardized equipment across a team, this Colt M4 upper receiver assembly provides the dependable platform that has served professional operators for decades.

The M4 upper receiver pattern remains the standard across law enforcement and military units, ensuring compatibility with standard lower receivers and a vast ecosystem of aftermarket handguards, optics mounts, and accessories. This modularity allows users to customize the rifle for specific mission requirements while maintaining the reliability and control of a Colt-manufactured core component.