This is a Doublestar Corp. Bolt Carrier Group, model AR100.
This complete bolt-and-carrier group easily drops into a standard mil-spec AR-15 upper" and it's ready to shoot. Batch magnetic particle inspected bolt gives long service life. Bolt and carrier feature a matte black phosphate finish that resists heat" wear and corrosion. Carrier is chrome lined and has a staked gas key. Includes bolt assembly" firing pin" firing pin retaining pin" cam pin and complete carrier.
Features:
Black Phosphate Coating
158 Carpenter Steel Bolt
8620 Steel Carrier
