WMD Guns Charging Handle Assembly AR-15/M16 NiB-X Nickel. Lightweight billet aluminum construction adds strength over forged aluminum yet keeps weight to a minimum. The NiB-X nickel boron surface coating provides a lubricious surface and ensures smooth cycling as it minimizes fouling or grit adhesion. Fits mil-spec AR-15/M16 upper receivers. In color to match our Accent Kits Specifications for WMD Guns AR-15/M16 Charging Handle Assembly: Manufacturer: WMD Guns Finish: NiB-X Fabric/Material: 7075 Aluminum Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: M16 AR-15 Condition: New Package Contents: WMD Guns AR-15/M16 Charging Handle Assembly What firearm models does the manufacturer say WMD Guns AR-15/M16 Charging Handle Assembly is compatible with? The manufacturer suggests that WMD Guns AR-15/M16 Charging Handle Assembly is compatible with AR-15 M16WMD Guns 1-NIBXCH: Charging Handle Assembly AR-15/M16 NiB-X Nickel