Faxon Firearms 15A38P10Ngpcl Duty Series 300 Blackout 10.50" Black Chrome Mag Phosphate

The Faxon Firearms Duty Series 300 Blackout barrel is a 10.50" replacement barrel built for shooters who run suppressed subsonic loads or want a compact platform without sacrificing velocity in supersonic applications. This is a direct-fit component for AR-platform rifles, engineered with a black nitride finish and phosphate coating for corrosion resistance in hard-use environments. Whether you're building a dedicated .300 Blackout upper, swapping barrels on an existing rifle, or setting up a short-barreled integrally suppressed system, Faxon's Duty Series delivers the precision and durability you expect from a purpose-built combat/hunting barrel.

At 10.50", this barrel length is the sweet spot for .300 Blackout: it provides enough dwell time for reliable cycling with both standard and subsonic ammunition, while keeping your overall gun length manageable for vehicle, home-defense, or backcountry carry. The black chrome finish combined with mag phosphate coating offers excellent rust prevention—important if you're running this in wet conditions or storing it long-term. Faxon is known for attention to detail in their manufacturing, and this barrel reflects that standard.

Replacement barrels let you get maximum value from your AR platform: swap uppers or components without buying a whole new firearm. If you're already invested in a .300 Blackout build, a quality spare barrel is practical insurance. If you're starting fresh, this barrel pairs with any standard AR-15 upper receiver and bolt carrier group compatible with .300 Blackout.

Key Features

• 10.50" barrel length optimized for .300 Blackout subsonic and supersonic loads
• Black nitride and phosphate finish for corrosion resistance and durability
• Designed for AR-platform rifles
• Compact profile suitable for suppressed or short-barreled builds

Specifications

Frequently Asked Questions

Will this barrel work with my current AR-15 upper?

Yes—this is a standard .300 Blackout barrel designed for AR-15 upper receivers. You'll need a .300 Blackout bolt carrier group and compatible magazines, but the barrel itself uses industry-standard AR tooling and headspace.

Is this barrel suitable for suppressed shooting?

The 10.50" length is well-suited to suppressed .300 Blackout builds, especially when running subsonic ammunition. You'll want to verify dwell time and cycling reliability with your specific bolt carrier group and load combination once assembled.

What does the black nitride and phosphate coating protect against?

The finish resists corrosion and rust, which is especially valuable if you're shooting in wet conditions, storing the barrel for extended periods, or running a suppressor (which can trap moisture). It also provides a durable, professional appearance that holds up to hard use.

Can I use both subsonic and supersonic .300 Blackout ammo in this barrel?

Yes, .300 Blackout barrels are designed to fire both subsonic and supersonic loads safely. Cycling reliability with each type will depend on your bolt carrier group, gas system tuning, and whether you're using a suppressor.