Colt M4 to M5 Carbine Upper Reciever Kit 5.56 Nato 14.5 in. Heavy Barrel Black

The Colt M4 to M5 Carbine Upper Receiver Kit upgrades a legacy M4 platform with a complete 5.56 NATO upper receiver assembly featuring a 14.5-inch free-float heavy barrel. The M5 upper incorporates a one-piece M-LOK compatible handguard with a continuous MIL-STD-1913 top rail and an improved barrel retention interface for enhanced rigidity and accuracy. The kit includes an ambidextrous charging handle and folding iron sights, providing a modernized upper assembly that installs on compatible lower receivers.

• Complete upper receiver conversion kit
• Caliber: 5.56 NATO
• Barrel Length: 14.5"
• Free-float heavy barrel
• Chrome-lined barrel
• 1:7 twist rate
• Direct impingement gas system
• Carbine-length gas system
• One-piece M-LOK free-floating handguard
• Continuous MIL-STD-1913 top rail
• Improved barrel retention interface
• Self-centering barrel nut and keyed barrel extension