WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps NiB-X Aztec Teal 1-NIBXURF-Aztec Teal. Built out with a topcoated NiB-X ejection port cover door and forward assist. Ideal building block for a long lasting AR15. This 7075 T6 Aluminum forged...