Colt Colt M4 to M5 Carbine Upper Reciever Kit 5.56 Nato 14.5 in. Heavy Barrel Black CM556-14H-CK

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;Ambidextrous Radian Raptor charging handle;Troy folding metal front sight;Troy folding metal rear sight;Black finish;Compatible with Colt M4 lower receivers