WMD Guns .308 Charging Handle Assembly NiB-X Silver. 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. In color to match our Accent Kits Specifications for WMD Guns .308 Charging Handle Assembly: Manufacturer: WMD Guns Finish: NiB-X Fabric/Material: 7075 Aluminum Caliber: .308 Winchester Gun Make: AR Platform Gun Model: AR308 Projectile Caliber: .308 Caliber Package Contents: WMD Guns .308 Charging Handle Assembly What firearm models does the manufacturer say WMD Guns .308 Charging Handle Assembly is compatible with? The manufacturer says that WMD Guns .308 Charging Handle Assembly is compatible with AR308WMD Guns 1-NIBXCH308: .308 Charging Handle Assembly NiB-X Silver