• NiB-X nickel boron surface coating inside and out
  • NiB-X coating provide a lubricious surface and ensures smooth cycling as it minimizes fouling or grit adhesion
  • "T" numbers engraved
  • Machined shell deflector, forward assist slot, and dust cover port (port door and forward assist not included)
  • M4 style feed ramps
  • Compatible with Mil-Spec AR-15 parts
  • Available in NiB-X Nickel Boron (Silver finish), NiB-X Nickel Boron with Black Ceramic Topcoat, and NiB-X Nickel Boron with Flat Dark Earth Ceramic Topcoat


  • Material: 7075-T6 Aluminum
  • Finish:
    • NiB-X Nickel Boron
    • NiB-X Nickel Boron with Black Ceramic Topcoat
    • NiB-X Nickel Boron with Flat Dark Earth Ceramic Topcoat
  • Weight: 7.2 oz.


  • AR-15 lower receiver


While billet uppers have been popular for some time, there are some very good reasons that forged uppers continue to hold their own on the market. Forged Uppers are strong, the grain of the metal aligns during the forging process creating better strength than many billet uppers can boast. After machine finishing, forged uppers offer quality fitment and remain within tight tolerances. If you’re looking for a quality Nickel Boron coated upper receiver, the WMD guns NiB-X Nickel Boron coated upper receiver is an excellent quality AR-15 upper available in a variety of outer finishes for you to choose from, so you can create your ideal rifle.

WMD Guns NiB-X AR Upper Receiver

WMD’s NiB-X A3/A4 upper receivers feature M4 feed ramps. These are stripped 7075 T6 forged aluminum receivers. Use one of these receivers as the foundation for your next AR build and give yourself complete control over the final product. Each of these receivers features a full coat of WMD’s proprietary NiB-X Nickel Boron surface coating. Wing Tactical offers solid NiB-X uppers as well as uppers externally coated with ceramic topcoats. Ceramic coated uppers are available in Flat Dead Earth or Black and are all NiB-X inside, so they retain the important abrasion and friction resistance and self-lubricity of this next-generation Nickel Boron product. NiB-X features nearly double the hardness of Anodized aluminum finishes and wears 30% longer than hard chrome finishes.

Choose WMD NiB-X Components from Wing Tactical

Wing Tactical is proud to give our consumers access to a wide variety of cutting-edge components, including WMD Guns’ NiB-X AR-15 uppers. We believe these uppers represent a great value to shooters of all kinds. Choose a NiB-X upper and give yourself an edge.

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Reviews (4)

  • WMD Upper

    Posted by Mark Stanford on 4th Jan 2022

    Everything looks as it should. Excellent quality and just what I needed for my build.

  • Perfect for my nickel boron build

    Posted by Christopher Waller on 19th Nov 2021

    The Nickel Boron coating is top-notch. The coating is thick which is perfect for my match-grade build. The barrel and lower fit tightly with this upper. Some people might want loose-fitting for easier assembly. But for a precision build, the tighter the better. You can file down tight parts to make them fit, but you can't add material to make them fit tightly.

  • Great service by Wing Tactical but product not good

    Posted by Ruben Picon Feliciano on 24th Mar 2021

    First the good: Wing Tactical is a great business place to buy AR-15 parts. Fast shipping and everything arrived well packed. The Bad: The bad is not Wing Tactical fault but the quality of the product by WMD Guns. Upper receiver had an excellent fit into PSA lower receiver, however, upper didn't have T-marks like the specs said, fit in the barrel receiver is impossible with at least 3 different barrels I have. In other words, I need to find an armorer or gun smith to see if they can polish the barrel receiver in order to fit a barrel. I'm sure they can but I cannot do that at home like with all my other receivers. Last, the "black" powder coating is in name only as in any light source (including outside with the sun) the receiver looks gray. There is no way that is considered black. In addition to the excellent fit in the lower receiver, the other good thing about the upper is the interior nickel boron finish that will make easier for cleaning and check that there are no carbon residues after cleaning. Everything else, this upper receiver is not worth $145!!! Really disappointed with this upper. I bought other things from Wing tactical and everything is good quality.

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