WMD Guns Upper Receiver Features The WMD Guns Upper Receiver is forged from 7075 T6 aluminum to Mil Spec dimensions giving builders a strong dependable foundation for an AR-15 build. Configured in the A3/A4 pattern with M4 feed ramps machined into the receiver this upper is designed to feed reliably with a wide range of magazines and ammunition. WMD s proprietary NiB-X nickel boron coating is applied inside and out providing an exceptionally tough ultra smooth surface finish that resists wear far better than a standard anodized coating. That same coating also improves lubricity within the receiver helping the bolt carrier group cycle smoothly over extended use. Finished in a distinctive nickel color this upper receiver stands apart from the typical black anodized finish found on most AR-15 builds while delivering the same Mil Spec forged strength. Sold as a stripped receiver the upper is ready for builders to install their own barrel bolt carrier group and handguard to complete a custom 5.56 NATO rifle. WMD Guns built this receiver as an ideal building block for a long lasting AR-15 combining forged strength with a coating technology that outperforms standard finishes in both wear resistance and corrosion protection. For builders seeking a durable corrosion resistant foundation for their next AR-15 project the WMD Guns Upper Receiver is available for sale at GrabAGun. WMD Guns Upper Receiver Specifications Manufacturer: WMD Guns Model: Upper Receiver Type: Upper Caliber: 5.56 Color: Nickel Finish: NiB-X Material: 7075 T6 Aluminum Available At: GrabAGun