Colt M4 to M5 Commando Upper Reciever Kit 5.56 Nato 11.5 in. Heavy Barrel Black

The Colt M4 to M5 Commando Upper Receiver Kit is a complete 5.56 NATO upper receiver assembly designed to modernize legacy M4 platforms. It features an 11.5-inch chrome-lined heavy barrel, a one-piece free-floating M-LOK handguard, and a continuous MIL-STD-1913 top rail for mounting optics and accessories. The M5 upper incorporates an improved barrel retention interface with a self-centering barrel nut and keyed barrel extension for enhanced rigidity and accuracy. The kit includes an ambidextrous Radian Raptor charging handle and folding Troy BattleSights.

• Complete upper receiver conversion kit
• Caliber: 5.56 NATO
• Barrel Length: 11.5"
• Heavy barrel
• Chrome-lined barrel
• 1:7 twist rate
• Direct impingement gas system
• Carbine-length gas system
• One-piece free-floating M-LOK handguard
• Continuous MIL-STD-1913 top rail
• Improved barrel retention interface
• Self-centering barrel nut