• Made in the U.S.A.
  • NiB-X Nickel Boron trigger group
  • NiB-X coating for extreme durability, performance and reliability
  • Nitromet (Melonite) parts for corrosion resistance and true black appearance
  • Fits all Mil-Spec AR-15 / M16 lower receivers
  • Does not come with pistol grip


  • AR-15 lower receiver

Available in Mod2 and Mod3 configurations:

  • Mod2: Mil-Spec lower parts with NiB-X Nickel Boron fire control group; NiB-X Nickel Boron bolt catch, mag catch, mag catch button, front pivot pin, rear takedown pin, and safety selector.
  • Mod3: Mil-Spec lower parts with NiB-X Nickel Boron fire control group; Nitromet bolt catch, mag catch, mag catch button, front pivot pin, rear takedown pin, and safety selector.


  • 1x Takedown Pin
  • 1x Receiver Pivot Pin
  • 2x Takedown Pin Detent
  • 2x Takedown Pin Detent Spring
  • 1x Bolt Catch
  • 1x Bolt Catch Plunger
  • 1x Bolt Catch Roll Pin
  • 1x Bolt Catch Spring
  • 1x Buffer Retainer
  • 1x Buffer Retainer Spring
  • 1x NiB-X Hammer
  • 1x NiB-X Trigger
  • 1x Hammer Pin
  • 1x Trigger Pin
  • 1x Hammer Spring
  • 1x Trigger Spring
  • 1x NiB-X Disconnector
  • 1x Disconnector Spring
  • 1x Magazine Catch
  • 1x Magazine Catch Spring
  • 1x Magazine Release Button
  • 1x Safety Selector
  • 1x Selector Detent
  • 1x Selector Detent Spring
  • 1x Pistol Grip Screw and Washer
  • 1x Trigger Guard and Roll Pin


When you're building your AR-15, you need a lot of small parts to complete your lower receiver. Eliminate the hassle of buying parts individually by purchasing the WMD Guns AR-15 Lower Parts Kit With NiB-X Nickel Boron Trigger Group. This kit comes with everything you need to build a high-performance AR-15 lower receiver, delivered in one convenient package.

Advanced Coatings

When you buy a WMD lower parts kit from Wing Tactical, you'll get superior parts with next-level finishes. WMD goes through a painstaking process to create coatings that offer optimal hardness and lubricity.

Numerous parts — including the hammer, trigger and disconnector — are plated with WMD's NiB-X, the hardest nickel boron coating on the market. NiB-X provides superior durability and reliability to strengthen parts and extend their life span. It also minimizes friction and wear, significantly reducing the need for frequent lubrication and cleaning to keep the parts working smoothly.

Other essential parts — such as the bolt catch, magazine catch and safety selector — are coated with Nitromet, a hard, durable melonite finish. Nitromet offers superior corrosion resistance and promises to outlast mil-spec and anodized finishes in most applications. It also gives the parts a true black appearance for a sleek look that complements your rifle.

Find Nickel Boron Lower Receiver Parts for Sale From Wing Tactical

Give your AR-15 a lasting edge by installing a WMD nickel boron lower receiver parts kit. At Wing Tactical, we carry WMD lower parts kits compatible with Mod2 and Mod3 configurations to meet your needs. Get in touch with us today to learn more.

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Reviews (3)

  • WMD Lower parts kit

    Posted by Kasey on 4th Feb 2021

    Excellent product! Love the NIB-X coating. Will definitely order again.

  • Lower parts kit

    Posted by Chris on 6th May 2020

    Nice kit, no issues at all.

  • I love the trigger

    Posted by Unknown on 21st Apr 2018

    Everything in the kit fit easily, except for the Mag release roll pin, which I had to sand down a touch. I didn't penalize the product, because it could have been the receiver at fault. I like the look and feel of the nitromet coatings and think they are worth the upgrade cost. Finally, I love the trigger group in this kit. There is very little creep and the break is crisp. I'm confident that I'll be able to shoot very well with this trigger.

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