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WMD Guns NiB-X Matte Nickel 16" .300 Blackout Complete Upper Assembly - 1-NIBXUA300BO-16
Product Description
Deploying a modern carbine configuration for heavy intermediate rounds like the .300 AAC Blackout introduces an immediate physical and maintenance bottleneck: direct gas impingement fouling. Standard anodized receiver sets and uncoated steel parts act like a magnet for abrasive carbon slurry, spent powder residue, and unburnt chemical scale, baking them onto moving parts under high chamber heat. This intense buildup slows down cycling velocity and leads to premature failure-to-feed or extraction errors if the gun is run with minimal lubrication. The **WMD Guns NiB-X® Complete Upper Assembly** completely eliminates these maintenance liabilities, wrapping a match-grade 16-inch barrel and unibody receiver matrix inside a proprietary, ultra-slick nickel boron performance coating built to ensure smooth operation in the harshest field environments.
Precision-machined from forged 7075-T6 structural aerospace aluminum alloy, this complete upper assembly provides exceptional structural stiffness that actively deflects heavy cyclic vibrations and rough handling stress. Rather than settling for a standard black paint or hardcoat anodized skin, WMD Guns treats the entire outer receiver shell and matching handguard with their flagship **NiB-X® Nickel Boron coating**. Formulated by a specialized team of metallurgists and plating engineers, this generation-5 autocatalytic chemical bond delivers a uniform silver finish rated at an incredible 70+ Rockwell C hardness—making it harder than hard chrome and virtually impervious to trail moisture, rust, and surface scrapes.
In high-velocity live-fire tracking sequences or demanding suppressed lanes, the premium components of the 1-NIBXUA300BO-16 model deliver match-grade precision. At its core is a premium 16-inch Chrome-Moly Vanadium steel barrel, optimized to stabilize both light supersonic hunting payloads and heavy subsonic duty ammunition with equal ease. The package includes a fully polished **NiB-X coated bolt carrier group (BCG)** and charging handle, providing a self-lubricating interface with a coefficient of friction nearing Teflon. This design allows you to run the action completely dry when oil isn't practical. Outfitted with a sleek 15-inch M-LOK free-float handguard for slim accessory mounting and a multi-port muzzle compensator to flatten recoil rise, this optics-ready upper is a rugged, clean-running choice for your next custom build.
*Armorer Bench Notes & Technical Maintenance Guidance: The WMD Guns 1-NIBXUA300BO-16 complete upper group is designed to drop natively onto any standard mil-spec AR-15 lower receiver assembly, utilizing standard 0.250-inch takedown pins. Because the .300 Blackout cartridge utilizes standard 5.56 NATO bolt faces and magazine geometry, you can natively track your existing AR-15 magazine wells without shifting hardware. The standout operational feature of the NiB-X formulation is its extremely low affinity for carbon bonding. When performing routine post-range cleanup on your bench, you can skip harsh chemical solvents and metal wire scrubbers—simply wipe down the smooth silver BCG and upper interior tracks with a clean microfiber cloth and a few drops of light CLP to lift away baked-on fouling. Periodically verify the tightness of the gas key fasteners and clean the multi-slot muzzle compensator ports with a nylon detail brush to keep gas venting running true.
Key Features
- Proprietary NiB-X® Performance Shield: Coated inside and out with WMD’s premium nickel boron formula, delivering a self-lubricating surface that repels carbon grime and wipes clean effortlessly.
- Match-Grade 16-Inch Precision Barrel: Crafted from premium Chrome-Moly Vanadium steel to ensure exceptional downrange precision and structural longevity across supersonic and subsonic arcs.
- Complete Polished NiB-X BCG Included: Ships factory-equipped with a full-auto profile nickel boron bolt carrier group, minimizing moving friction and optimizing cycle timing.
- 15-Inch Modular M-LOK Handguard: Features a flush top Picatinny rail section paired with deep-cut M-LOK layout windows to mount tactical lights, lasers, and grips without creating bulk.
- Integrated Muzzle Compensator: Outfitted with a high-efficiency multi-port muzzle brake that redirects expanding gasses to flatten muzzle rise during rapid tracking strings.
Product Specifications
- Brand: WMD Guns
- Model Line: High-Performance NiB-X® Coated Upper Receiver Group
- MPN/SKU: 1-NIBXUA300BO-16
- UPC Code Profile: 854839008818
- Caliber Focus: .300 AAC Blackout (7.62x35mm)
- Barrel Length: 16.0 Inches (406mm)
- Receiver Chassis Material: Forged 7075-T6 Structural Aerospace Aluminum (Includes Forward Assist & Port Cover)
- Handguard Profile System: 15.0" Slim Free-Float M-LOK Attachment Rail
- Primary Finish Shield: Electroless NiB-X® Nickel Boron Coating (70+ Rc Hardness)
- Enclosure Finish Tone: Matte Polished Nickel (Satin Silver)
- Bolt Carrier Group: Included M16-Profile Mil-Spec MP Tested NiB-X Coated BCG
- Charging Handle Interface: Included Standard Charging Handle with NiB-X Finish
- Gas Track Architecture: Low-Profile Gas Block with High-Durability Gas Tube (Direct Impingement)
- Muzzle Attachment Interface: High-Efficiency Multi-Port Muzzle Compensator (5/8x24 Thread Taper)
- Sighting Interface Profile: Continuous Monolithic Top Picatinny Rail (Optics Ready Baseline)
- Country of Manufacture: United States
