ZEV Technologies AR15 Forged Upper Receivers Black. ZEV starts with high-quality 7075 T6 aluminum forgings and final machines them to better than mil-spec dimensions held to .001? tolerances giving you maximum compatibility with mil-spec and aftermarket parts and accessories. The ZEV Technologies Forged AR-15 Upper Receiver offers superb strength and versatility for building an AR-15 configured exactly the way you want it. Specifications for ZEV Technologies AR15 Forged Upper Receivers: Manufacturer: ZEV Technologies Color: Black Finish: Class 2 Type 3 Hard Coat Anodize Fabric/Material: 7075-T651 Aluminum Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: AR-15 Condition: New Features of ZEV Technologies AR15 Forged Upper Receivers Machined from Forged made in specialized factories 7075-T651 aluminum True Black Class 2 Type 3 Hard coat anodize Compatible with all Mil-Spec parts kits T marked picatinny rail M4 feed ramps cut standard Package Contents: ZEV Technologies AR15 Forged Upper Receivers What firearm models does the manufacturer say ZEV Technologies AR15 Forged Upper Receivers is compatible with? The manufacturer says that ZEV Technologies AR15 Forged Upper Receivers is compatible with AR-15ZEV Technologies UR-556-FOR: AR15 Forged Upper Receivers Black