Colt M4 to M5 PDW 5.56 x 45mm 10.3" Heavy Bbl Matte Black Conversion Kit CM556-10H-CK

The Colt M5 CQC 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 close-quarters combat (CQC) and personal defense weapon (PDW) configurations, this factory-assembled kit features an advanced upper receiver design with an anti-torsion alignment lug. It incorporates a 10.3-inch chrome-lined, heavy profile carbon steel barrel utilizing a carbine-length direct gas impingement system housed within a 9.2-inch one-piece aluminum free-float M-LOK handguard to isolate the barrel from hand pressure and maximize shot-to-shot accuracy. Colt M4 to M5 PDW 5.56 x 45mm 10.3" Heavy Bbl Matte Black Conversion Kit CM556-10H-CK