WMD AR-15/M16 Full Auto Bolt Carrier Group – Nickel Boron for .223 / 5.56 Rifles
Not Yet Rated | Write the First Review SKU: 222-WMD-NIBXBCG-0001
UPC: 856000000000
MFG#: NIBXBCG-0001

Looking to upgrade your AR-15 for reliability, ease of maintenance, and long-term performance? Our NiB-X® Nickel Boron Full Auto Bolt Carrier Group (BCG) is engineered for .223 Remington and 5.56 NATO platforms—making it a perfect fit for any serious rifle build.

Built to mil-spec standards, this full auto BCG delivers smooth cycling, corrosion resistance, and unbeatable durability, even under harsh firing conditions or suppressed setups.

Why Choose This .223 / 5.56 Full Auto BCG?

If you’re running a modern AR-15 chambered in 5.56 or .223, you need a bolt carrier group that can take abuse and keep cycling. Here’s why this one stands out:

• Full Auto Profile
  The extra rear mass improves timing, reduces wear on lightweight builds, and adds reliability—whether you’re running suppressed, using a short barrel, or simply want a smoother shooting rifle.

• NiB-X® Nickel Boron Coating
  Our proprietary finish offers 40% more surface hardness than chrome. That means ultra-slick cycling, easier cleaning, and exceptional resistance to heat and fouling.

• Drop-In Compatibility
  Designed to run flawlessly in .223 Rem and 5.56 NATO AR-15, M16, and M4-style rifles. No mods needed—just drop it in and go.

• Battle-Tested Durability
  This BCG has survived over 30,000 rounds in military endurance testing. Each unit is shot-peened, magnetic particle inspected (MPI), and case-hardened to exceed standard requirements.

• No Special Licensing Required
  Although it’s built to full-auto spec, it’s 100% legal for civilian use and fully compatible with semi-auto AR-15s.

Technical Specs

• Caliber Compatibility: .223 Remington / 5.56 NATO

• Finish: NiB-X® Nickel Boron (Polished Silver)

• Material: 8620 steel carrier, Carpenter 158 bolt

• Testing: MPI, shot peened, heat treated

• Gas Key: Staked and sealed to mil-spec standards

• Made in the USA ✅

Real-World Performance

Whether you're shooting suppressed or unsuppressed, in cold or dusty environments, this BCG stays cleaner longer and cycles more reliably. It's ideal for:

• Suppressed AR-15 builds

• Short-barreled rifles (SBRs)

• Duty or home-defense carbines

• High-volume shooting sessions

Spend less time scrubbing carbon and more time pulling the trigger.

🧠 FA

Will this BCG work in my semi-auto AR-15?

Yes. Full-auto BCGs like this one are legal and fully compatible with semi-automatic AR-15 rifles. You’ll enjoy smoother cycling and better reliability.

Is this BCG compatible with both .223 and 5.56?

Absolutely. This BCG is designed for rifles chambered in .223 Remington and 5.56 NATO. It handles both with zero modifications required.

What are the benefits of nickel boron coating?

Nickel boron offers excellent lubricity, making the BCG easier to clean and more resistant to carbon buildup. It also reduces friction and wear on contact points, especially in suppressed or high-heat setups.

Do I need a tax stamp or special paperwork to use this?

Nope. Despite the “full auto” label, this BCG is legal for civilian use. You don’t need a tax stamp or any NFA items to purchase or install it.

How long will the NiB-X coating last?

The NiB-X® finish is lifetime guaranteed and tested to withstand over 30,000 rounds without chipping, flaking, or excessive wear.

⚙️ Upgrade Your AR Today

Don’t let reliability issues slow you down. Whether you're building your first rifle or enhancing a trusted workhorse, this Nickel Boron BCG delivers the performance your .223 / 5.56 deserves.

✅ In stock — ships fast
✅ Backed by WMD’s quality guarantee
✅ Trusted by defense contractors and firearm professionals nationwide

Order your AR-15 Full Auto BCG today and experience the NiB-X® difference.