Colt M4 Upper 5.56 11.5in Lightweight Upper Receiver

The Colt M4 Upper 5.56 11.5" LW Black combines Colt's renowned craftsmanship with a lightweight, ready-to-strike upper designed for versatile shooting platforms, delivering a complete upper receiver assembly that accommodates 223 Rem/556NATO chambers. Featuring an 11.5-inch lightweight barrel and a durable black finish, this upper delivers responsive handling and improved mobility without sacrificing accuracy, making it an excellent choice for compact builds, sport shooting, or field scenarios where maneuverability is key. An A2 fixed front sight pairs with a Magpul BUIS rear sight to provide reliable co-witness performance and fast target acquisition in varied lighting conditions, while the precision-fit upper ensures smooth cycling and compatibility with standard AR-15 components. The combination of Colt's manufacturing expertise and a lightweight barrel profile supports efficient heat management and steady field performance during extended sessions. Use this complete upper to accelerate assembly of a high-performing rifle configuration, enabling quick deployment for training, competitive shooting, or reliable general-purpose use where a compact, capable upper is desired.