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Billet Beast – 16-inch 5.56 AR-15 Rifle

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Built on a matched set of receivers cut from billet aluminum, the WMD Guns Billet Beast® AR-15 is a sleek, maneuverable masterpiece of premium components and WMD coating technology. 

The Billet Beast is chambered in 5.56 NATO, sports a 16-inch barrel and is treated with our NiB-X® nickel boron coating on every critical surface. Between our hand-selected components and the lubricity and reliability you only get from a nickel boron-coated AR, it‘s designed to shrug off wear and carbon buildup to perform flawlessly in any environment.

The 5.56 Billet Beast is sold with two 30-round NiB-X® magazine and a tactical bag so you can hit the range on day one — and expect MOA or better groups out of the box and with factory loads. Check out the full description below for more on what this Beast can do and how to buy through WMD Guns.

SKU: NIBX556 Return Policy



The 5.56 Billet Beast®

The 5.56 Billet Beast® is a slick, reliable nickel boron-coated AR rifle with a 16-inch barrel that arrives ready to deliver unmatched performance and sub-MOA accuracy. 

We built this short AR-15 on a set of aircraft-grade 7075 billet aluminum receivers and gave its critical parts — inside and out — our proprietary NiB-X® coating as a finish. The result is a compact AR-15 rifle that shrugs off carbon buildup, friction and the elements while turning heads and outperforming the competition.

Why Is a Nickel Boron AR Better?

Nickel boron is 40% harder than chrome and incredibly resistant to corrosion and buildup — two of the primary causes of problems with firearm function. The AR platform is particularly vulnerable to carbon buildup due to its gas-powered design, so an AR-15 with nickel boron parts has an inherent advantage over other builds. 

The Billet Beast® has a NiB-X® coating on its receivers, handguard and small parts to take full advantage of nickel boron’s capabilities. This coating isn’t just hard — it’s incredibly slick. That natural lubricity lets the gun continue to function reliably much longer than lesser builds and makes cleaning a simple matter of wiping carbon away with a rag. 

WMD Guns specializes in industry-leading nickel boron coatings because we were part of the team that pioneered their application to guns and their components. Exceptional coatings like NiB-X® are our thing, and it’s why every formula and every firearm we put it on excels in the field. 

Features of the 5.56 Billet Beast® Rifle

With its bright satin nickel finish, the aesthetic appeal of the Billet Beast® is undeniable — and it has the function to back up the flash. The coated billet receivers are matched with a 15-inch NiB-X® M-LOK® handguard closely fit to a match-grade, hammer-forged 16-inch barrel. A satin nickel muzzle brake punctuates the barrel for recoil control. 

On the inside, the Billet Beast® contains a polished nickel boron bolt carrier group and our enhanced NiB-X® fire control group for extreme reliability. The other small parts are finished in black nitride to match a high-performance adjustable stock and a comfortable Ergo grip. 

The Billet Beast® will arrive kitted out with one 30-round NiB-X® magazine and a tactical bag. In our testing, it went straight to the range and delivered tight groups with off-the-shelf ammunition:

  • Federal 69gr Match Kings = .75 MOA at 200 yards 
  • Hornady 55gr FMJBT = 1.25 MOA at 100 yards 
  • Federal American Eagle 55 gr FMJBT = .50 MOA at 100 yards

Order Your 16-Inch Nickel Boron AR-15 Through WMD Guns

Maneuverable, reliable and eye-catching — the Billet Beast® is everything a compact AR-15 is supposed to be. It’s also made in the USA and backed by a 100% satisfaction guarantee. 

If you’re new to the process, visit our guide on how to order our guns online, then check out through this page to get your hands on the 5.56 Billet Beast®. 


Lower Receiver

Billet 7075-T6 Aluminum Machined To Mil Spec Dimensions, Front Magazine Well Finger Grips, NiB-X® Nickel Boron Coated For Durability

Upper Receiver

Billet Mil-Spec 7075-T6 Aluminum With M4 Feed Ramps. NiB-X® Coated For Lubricity And Durability


Match Grade Chrome Moly Vanadium Steel, 1:8 Twist, 16″ Government Or M4 Profile, Carbine Gas System, Nitromet QPQ Salt Bath Nitrided In The Bore For Extended Life And Accuracy, NiB-X® Coated On The Outside For Durability And Heat Dissipation


5.56mm NATO

Barrel Extension

NiB-X® Coated Barrel Extension For Extremely Smooth Locking And Unlocking With The Bolt

Gas System

Low Profile Gas Block, CNC Machined From 4140 Steel And NiB-X® Finished, Nitromet QPQ Carbine Length Gas Tube, Direct Impingement

Muzzle Device

Compensator, 17-4 PH Stainless Steel, NiB-X® Coated

Bolt Carrier Group

M16 Profile, Mil-Spec MP Tested, NiB-X® Coated For Reliability And Ease Of Cleaning, Properly Staked Gas Key

Fire Control Group

Hammer, Trigger and Disconnect coated in NiB-X® for lower pull force (<6 lbs) and smooth reset


Carbine Buffer


Optics Ready


Free Float Aluminum, M-LOK® 15" NiB-X® Coated Handguard

Receiver Extension

6 Position Mil-Spec 7075-T6 Aluminum, NiB-X® Coated Inside And Out


Ti-7 Black Triangular Cheek-Weld Design For Comfort, Rugged Materials For Durability, Rubber-Like Buttplate For Non-Slip Contact Surface, 2 Water-Resistant Storage Chambers For Batteries Or Cleaning Kits

Pistol Grip

Black Pistol Grip Black Pistol Grip


Ballistic Fabric Tactical Bag With Exterior Magazine Pockets, Shoulder Backpack Straps, Range Ready.


7.1 lbs


33" – 36.5"


2 NiB-X® Coated 30 Round Aluminum Magazines With Magpul Followers

California Compliant

No, Add Juggernaut to make CA Compliant – $78


Left-handed Option

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Please note that this product can only be shipped to an authorized FFL dealer. You may purchase this product from WMD Guns online store, but to receive your product, you will need to do the following:

  • Send your order receipt to an authorized FFL dealer in your state.
  • Ask them to forward your order number plus their FFL license to WMD Guns at customerservice@dev.wmdguns.com or fax to (772) 618-1795.