WMDs Gas Key is coated with NiB-X nickel boron coating inside and out. Replacing chrome on the ID with NiB-X provides 30% more hardness and wear resistance. Specifications for WMD Guns AR-15 NiB-X Gas Key: Manufacturer: WMD Guns Color: Nickel Finish: NiB-X Gun Make: AR Platform Gun Type: Rifle Package Contents: WMD Guns AR-15 NiB-X Gas Key
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