Colt M4 to M5 Carbine Upper Receiver Kit 5.56 NATO

Colt M4 to M5 Carbine Upper Receiver Kit

This upper receiver assembly represents a straightforward upgrade path for shooters looking to modernize their carbine platform. Colt's engineering delivers a purpose-built component designed for those who understand the value of quality manufacturing.

Key Features

• 14.5-inch Heavy Barrel: Provides enhanced accuracy and sustained fire capability compared to standard carbine barrels
• 5.56 NATO Chambering: The most common and practical rifle cartridge for modern sporting use
• Direct Drop-In Design: Engineered for straightforward installation on compatible lower receivers
• Professional Construction: Colt's reputation for precision manufacturing ensures reliable function
• Black Finish: Durable, low-visibility coating suitable for any application

What You're Getting

This is a complete upper receiver assembly—the top half of your rifle. It includes the barrel, bolt carrier group, and all necessary components for a functioning upper. You'll need a compatible lower receiver to complete your build.

Practical Considerations

The heavier barrel profile improves heat management during extended shooting sessions and provides a more stable platform for accurate fire. This makes it suitable for both recreational shooting and more demanding applications. The 14.5-inch length strikes a balance between maneuverability and velocity, a proven formula that has served well in professional and civilian use alike.