WMD BOLT ASSEMBLY 450 BUSHMASTER

The WMD Bolt Assembly 450 Bushmaster is a high-performance drop-in bolt built to handle the demands of big-bore AR shooting. Engineered from 9310 case-hardened steel and treated with WMD's NiB-X nickel boron coating, this bolt delivers the reliability and longevity you need whether you're running subsonic loads or full-power rounds downrange. The nickel boron finish speeds cleanup after range sessions and cycles smoothly against barrel extensions—a real advantage when you're shooting a cartridge that generates serious heat and fouling.

This assembly comes complete and ready to install. The extractor is machined from the same hardened steel as the bolt body and benefits from shot peening for durability, while a high-performance ejector spring ensures consistent case ejection. WMD's engineering team included proper gas rings to manage bolt carrier function under the pressures of 450 Bushmaster, and magnetic particle inspection during manufacturing catches any metallurgical flaws before the bolt ships to you. For shooters building or upgrading a 450 Bushmaster upper, a quality bolt assembly is where reliability starts—and this one won't let you down.

Drop it into your existing bolt carrier group, or pair it with a compatible carrier for a complete upgrade. The NiB-X coating resists corrosion even in humid climates, and the smooth finish means less friction and easier field cleaning when you're far from a bench. If you're serious about 450 Bushmaster performance, starting with a precision bolt assembly like this one pays dividends over the life of your rifle.

Key Features

• NiB-X nickel boron coating for reduced friction, faster cleaning, and extended service life
• 9310 case-hardened steel construction, shot peened for impact resistance
• Magnetic particle inspected for manufacturing quality assurance
• High-performance extractor and ejector spring for reliable case handling
• Gas rings tuned for 450 Bushmaster pressures and cycling
• Drop-in compatible with standard AR-pattern bolt carriers

Specifications

Frequently Asked Questions

Will this bolt work with my 450 Bushmaster upper?

Yes. The WMD Bolt Assembly 450 Bushmaster is engineered specifically for this cartridge and drops into any standard AR-pattern bolt carrier group. Make sure your carrier and upper are also rated for 450 Bushmaster, as the pressures and dimensions of this round differ from standard 5.56 or .308 builds.

What's included in the assembly?

You receive a complete bolt assembly with the bolt, extractor, ejector spring, and gas rings all installed and ready to function. It's a drop-in unit—no additional components required for installation.

Why does the NiB-X coating matter?

NiB-X nickel boron reduces fouling buildup, cuts cleaning time significantly, and provides superior corrosion resistance. It also decreases friction between the bolt and carrier, which improves cycle reliability and extends the life of both components, especially important in a heavy-hitting round like 450 Bushmaster.

Is this bolt inspected before shipping?

Yes. The bolt undergoes magnetic particle inspection during manufacturing to identify any internal defects or inclusions in the steel before it leaves WMD's facility, ensuring you receive a part built to exacting standards.