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 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. ZEV Forged Lower Receiver features:

Machined from Forged American Made 7075-T651 aluminum
Machined with BETTER that Mil-Spec requirements, with critical tooling dimensions held within +/- .001”
True Black Class 2 Type 3 Hard coat anodize
Compatible with all Mil-Spec parts kits
Laser T marked picatinny rail
M4 feed ramps cut standard
Weight 7.2 oz