AR-15 5.56/.223 Bolt Assembly NiB-X Nickel Boron Complete Bolt

WMD Guns

$70.00

AR-15 – 5.56/.223 Bolt Assembly – NiB-X Nickel Boron – Complete Bolt

PLEASE DOUBLE CHECK DETAILS AND FITMENT BEFORE PURCHASE.

WMD Guns NiB-X Bolt Assembly is a complete AR-15 bolt built for .223 Rem / 5.56 NATO with WMD’s NiB-X nickel boron coating for slick cycling and easier cleaning. This is a full bolt assembly intended to drop into a standard mil-spec AR-15 carrier—great as a spare bolt, replacement bolt, or an upgrade when you want smooth lockup/unlock and less carbon drama.

Fitment

  • AR-15 bolt carriers for .223 Rem / 5.56 NATO
  • Standard AR-15 barrel extensions (5.56 pattern)

Does NOT fit

  • AR-10 / .308 platforms
  • Non-AR platforms or proprietary carrier systems

What it does

  • Replaces your bolt while retaining your existing carrier
  • NiB-X coating reduces friction and helps carbon wipe off easier
  • Includes extractor/ejector components and gas rings installed for a ready-to-run bolt

Why it’s worth it

  • Solid “spare bolt” insurance for hard-use rifles
  • NiB-X is slick, durable, and easier to keep clean than bare/phosphate parts
  • Built from case-hardened steel, shot peened and MPI for durability and QC

Specs

  • Caliber: .223 Rem / 5.56 NATO
  • Finish: NiB-X (nickel boron)
  • Construction: Case hardened, shot peened, magnetic particle inspected
  • Includes: extractor, ejector springs, gas rings, and O-ring buffer (installed)

What’s included

  • 1x Complete AR-15 bolt assembly (as configured from the factory)

Tools needed

  • None for basic swap into a compatible carrier
  • Recommended: headspace gauges for final verification

Install notes

  • Swap into your carrier like a standard AR-15 bolt
  • Verify extractor tension and gas ring condition during install
  • After install: function test and confirm reliability before duty/defense use

Verify before you buy

  • Confirm your platform is AR-15 (not AR-10)
  • Confirm your caliber/barrel extension is .223/5.56
  • Confirm headspace after any bolt change to prevent unsafe operation

⚠ Trademark & Compatibility Disclaimer
IronKells Armory LLC is not affiliated with, endorsed by, or sponsored by any manufacturer mentioned. All trademarks are the property of their respective owners and are used only to identify compatibility or fitment.

⚠ Install & Compatibility Disclaimer
Installation should be performed by a qualified armorer or gunsmith. Improper installation, modification, or use may affect firearm safety and reliability. Buyer is responsible for verifying compatibility, performing proper function testing, and ensuring safe operation.

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