Colt M4 to M5 Commando 5.56 x 45mm, 11.5" Heavy Bbl Matte Black Conversion Kit CM556-11H-CK

The Colt M5 Commando Upper Receiver Conversion Kit is a complete centerfire upper assembly chambered in 5.56mm NATO, engineered to upgrade legacy M4 or M16 platforms to Colt's modernized, free-floating M5 architecture. Purpose-built for high-mobility tactical setups, this factory-assembled kit features an advanced upper receiver design with an anti-torsion alignment lug. It incorporates a compact 11.5-inch chrome-lined, heavy profile carbon steel barrel utilizing a carbine-length direct gas impingement system housed within a 10.5-inch one-piece aluminum free-float M-LOK handguard to isolate the barrel from hand pressure and maximize shot-to-shot accuracy.