Energetic Armament Stainless Steel End Cap Muzzle Device 5.56mm Nitride Black. 56 rounds. The cap is machined from 17-4PH stainless with black nitride finish. Please note this cap does not include provision for the installation of a wipe as wipes are generally not recommended for supersonic 5.56mm use. Specifications for Energetic Armament Stainless Steel End Cap Muzzle Device: Manufacturer: Energetic Armament Caliber: 5.56mm Fabric/Material: Stainless Steel Color: Black Finish: Nitride Weight: 0.89 oz Package Contents: Energetic Armament Stainless Steel End Cap Muzzle Device Energetic Armament EA33: Stainless Steel End Cap Muzzle Device 5.56mm Nitride Black