WMD Guns Bolt Assembly Nib-X Finish - .223/5.56/300BLK

The WMD Guns 5.56 NATO / .223 Remington / .300 BLK Bolt Assembly is engineered for shooters who demand reliability, longevity, and smooth operation from their AR platform. Manufactured from case-hardened 9310 steel and finished with WMD’s proprietary NiB-X nickel boron coating, this bolt delivers reduced friction, enhanced corrosion resistance, and effortless cleaning.

The NiB-X coating is purpose-built to improve the locking and unlocking interaction with the barrel extension, resulting in smoother cycling and consistent performance under high round counts. Each bolt is magnetic particle inspected to ensure structural integrity and dependable function in duty, training, or competition rifles.

Equipped with a high-performance extractor, this bolt assembly is designed to maintain reliable extraction even under harsh conditions. Whether upgrading a worn component or building a premium AR-15, the WMD Guns NiB-X Bolt Assembly is a proven choice for performance-focused shooters.

Key Features

• Compatible with .223 Remington, 5.56 NATO, and 300 BLK AR platforms
• NiB-X nickel boron coating for reduced friction and easy cleaning
• Case-hardened 9310 steel construction for long service life
• Magnetic particle inspected for quality assurance
• High-performance extractor for reliable cycling

Specifications

• Manufacturer: WMD Guns
• Manufacturer Part Number: 1-NIBXBA556
• UPC: 855899003232
• Caliber Compatibility: .223 Remington / 5.56 NATO / 300 BLK
• Material: Case Hardened 9310 Steel
• Finish: NiB-X Nickel Boron
• Color: Silver
• Type: Bolt Assembly
• Category: Bolts and Bolt Carrier Group Components