Combat Armory AR-15 A3 Stripped Upper Receiver Black 7075-T6 The Combat Armory AR-15 A3 stripped upper receiver is a black receiver component made from 7075-T6 aluminum. A3 identifies the named receiver configuration, and the stripped designation distinguishes the receiver body from a complete assembled upper. The 7075-T6 designation describes the aluminum alloy and heat-treatment condition. Black describes the appearance without specifying an unverified coating process. For a component purchase, the receiver configuration and material are the relevant starting points; the stripped upper is a receiver component rather than a complete firearm package. Key Features Stripped upper: A receiver body rather than a complete upper assembly. 7075-T6 aluminum: Specifies the alloy and temper. Black color: The stated exterior appearance. Specifications Manufacturer: Combat Armory Type: Stripped upper receiver Configuration: AR-15 A3 Material: 7075-T6 aluminum Color: Black Shop the Combat Armory AR-15 A3 Stripped Upper Receiver Black 7075-T6 at BattleHawk Armory.