The Faxon Firearms Duty Series 450 Bushmaster 16-inch Big Gunner Barrel, Nitride (Faxon part no. 15A45016C16NGQ) gives AR-platform hunters a straight-wall-legal barrel built for the big-bore 450 Bushmaster cartridge. Faxon Firearms machines it in its Big Gunner contour, a heavier profile than a standard AR barrel that adds the extra material 450 Bushmaster needs for durability and consistent harmonics. A QPQ nitride finish case-hardens the bore and exterior against corrosion and wear, and a 1-16 twist rate is matched to the cartridge’s typical bullet weights. It’s built for hunters in straight-wall-cartridge states and anyone wanting a hard-hitting big-bore upper on the AR-15/AR-10 platform.

Key Specifications

• Chambered in 450 Bushmaster, a straight-wall cartridge legal for hunting in states that restrict bottleneck rifle rounds.
• 16-inch length meets the federal minimum barrel length for a rifle-configured upper.
• 1-16 twist rate matched to the bullet weights typically loaded for 450 Bushmaster.
• Big Gunner contour adds barrel mass over a standard profile for added durability and steadier harmonics.
• Nitride (QPQ) finish case-hardens the bore and exterior for corrosion and wear resistance.
• Built on Faxon’s Duty Series line, aimed at hard-use hunting and range rifles rather than ultra-light builds.

Frequently Asked Questions

What twist rate does this barrel use? A 1-16 twist, sized for the bullet weights common to 450 Bushmaster loads.

Is this barrel legal for straight-wall-cartridge hunting seasons? Yes, 450 Bushmaster is a straight-wall cartridge accepted in states that require one for rifle hunting.

What finish protects the barrel? A QPQ nitride finish that resists corrosion and wear on the bore and exterior.

Buy the Faxon Firearms Duty Series 450 Bushmaster 16-inch Big Gunner Barrel

Order it from our Lubbock, Texas gun shop for fast, insured direct shipping to your FFL, and put a hard-hitting AR-10 barrel on your next big-bore build.