Killer Innovations Icon Defense AR-15 Ambidextrous Billet Upper Receiver Flared Black. Receivers are finished with Mil-Spec Type 3 hard coat anodizing. Specifications for Killer Innovations Icon Defense AR-15 Ambidextrous Billet Upper Receiver: Manufacturer: Killer Innovations Color: Black Finish: Hard Coat Anodize Fabric/Material: 7075 Aluminum Features of Killer Innovations Icon Defense AR-15 Ambidextrous Billet Upper Receiver Billet Upper cut from 7075 Billet Aluminum. Tight Tolerances. Thermal Fit Barrel Extensions. Mil-Spec Type 3 Hard Coat. Package Contents: Killer Innovations Icon Defense AR-15 Ambidextrous Billet Upper Receiver AR-15 Upper Door Rod Killer Innovations BRCUP635BLK: Icon Defense AR-15 Ambidextrous Billet Upper Receiver Flared Black