The ZEV Technologies Forged AR-15 Upper Receiver comes stripped and ready for your next custom AR build. ZEV starts with high-quality 7075 T6 aluminum forging and final machines them to better than mil-spec dimensions held to A .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. FeaturesMachined from Forged American Made 7075-T651 aluminumMachined with BETTER that Mil-Spec requirements, with critical tooling dimensions held within +/- .001"True Black Class 2 Type 3 Hard coat anodizeCompatible with all Mil-Spec parts kitsLaser T marked picatinny railM4 feed ramps cut standard