Faxon Firearms 15A58M16Nhq Duty Series 5.56 Nato 16" Black Nitride 4150 Cmv Barrel

The Faxon Firearms Duty Series 5.56 NATO 16" barrel is a go-to upgrade for shooters building or refreshing an AR platform rifle. Built from 4150 CMV steel and finished in black nitride, this barrel delivers the durability and corrosion resistance serious shooters expect—whether you're running drills at the range, training for duty work, or maintaining a reliable home-defense setup. At 16 inches, it strikes a practical balance between velocity, handling, and maneuverability in a modern rifle platform.

Faxon has built a reputation for no-nonsense barrels that perform without premium pricing. The black nitride finish is tough and functional, proven in demanding environments. This is a straightforward barrel for AR builders who prioritize dependability over exotic coatings or exotic calibers—the kind of component that lets you focus on the build itself.

If you're replacing a worn barrel, assembling a second upper, or building a rifle from scratch, a quality 5.56 NATO barrel in this profile and finish is foundational. Pair it with your choice of bolt carrier group, handguard, and gas system to suit your specific use. Faxon's Duty Series barrels are the kind of part you install and forget about.

Key Features

• 4150 CMV steel construction for strength and longevity
• Black nitride finish for corrosion and wear resistance
• 16-inch length optimized for intermediate-range accuracy and handling
• 5.56 NATO chamber—the standard modern rifle cartridge
• Duty Series profile designed for reliability in demanding use

Specifications

Frequently Asked Questions

What AR platforms does this 5.56 NATO barrel fit?

This is a standard AR-15 pattern barrel compatible with AR-15 uppers. Confirm your upper receiver and bolt carrier group are also chambered in 5.56 NATO or .223 Remington for proper function.

Is the 16-inch length good for home defense or duty use?

Yes. The 16-inch length is a practical middle ground—short enough for close-quarters handling, long enough to deliver respectable velocity with 5.56 NATO ammunition. It's widely used in duty rifles and defensive rifles for exactly this reason.

What does "black nitride finish" mean, and is it better than other coatings?

Black nitride is a case-hardened finish that increases surface hardness and corrosion resistance. It's durable and functional, resisting rust and wear in field conditions. It's a proven finish for barrels in professional and tactical use.

What else do I need to build a complete upper with this barrel?

You'll need a bolt carrier group (chambered in 5.56 NATO), a gas tube, a gas block, a handguard, and an upper receiver. Depending on your build, you may also need a charging handle and forward assist assembly. This barrel provides the foundation; the other components depend on your specific rifle configuration and intended use.