Faxon Ar15 Barrel 350 Legend - 20" 1:16 Gunner Profile Blk

The Faxon AR-15 350 Legend barrel in 20-inch Gunner Profile combines the rugged durability you need for serious shooting with the lighter, more nimble handling that makes a practical rifle actually enjoyable in the field. Built from 4150 steel and treated with a hard nitride finish inside and out, this barrel is designed to handle the demands of 350 Legend hunting and range work without the heft penalty of a full Government-profile pipe. The Gunner Profile splits the difference: you get the structural integrity of a traditional mil-spec profile plus the reduced weight and better balance of a thinner design, making it an honest-to-goodness general-purpose AR that doesn't tire your arms during a long day of shooting.

Faxon button-rifled this barrel with a 1:16-inch twist rate optimized for 350 Legend performance. The 20-inch length pairs well with carbine-gas-system tuning to deliver consistent velocity and reliable function across the cartridge's range of commercial loads. The barrel features a standard .750-inch gas-block journal, so it'll work with most conventional gas blocks you likely already have on hand. Threading is 1/2-28 TPI—the modern standard for suppressors and muzzle devices.

Every barrel ships MPI-tested, meaning it's been magnetic-particle-inspected for hidden cracks or defects before it leaves Faxon's shop. That's the kind of quality control that matters when you're building a rifle you plan to trust. Whether you're assembling a new 350 Legend AR from a stripped lower or upgrading an existing upper, this is a no-compromise barrel that delivers accuracy, durability, and honest weight savings without a hype-y marketing spin.

Key Features

• 4150 steel construction with nitride finish—corrosion-resistant and hard-wearing
• Gunner Profile design balances durability and light weight for practical, all-purpose shooting
• Button-rifled with 1:16-inch twist rate optimized for 350 Legend
• Carbine-length gas system for reliable cycling across ammo variations
• MPI-tested for structural integrity—no hidden defects
• Standard .750-inch gas-block journal—fits most aftermarket and mil-spec gas blocks
• 1/2-28 TPI threaded muzzle for suppressors and muzzle devices

Specifications

Frequently Asked Questions

Will this Faxon 350 Legend barrel work with my existing AR-15 upper?

Yes, as long as your upper is a standard AR-15 platform. The barrel uses a standard .750-inch gas-block journal and 1/2-28 TPI muzzle threading, so it's compatible with most conventional gas blocks and aftermarket muzzle devices. Just make sure your upper receiver itself is chambered for 350 Legend or that you're building a new upper around this barrel.

What's the advantage of the Gunner Profile over a pencil or Government profile barrel?

The Gunner Profile blends features from both: it retains the structural durability and reliability of a Government-profile barrel while being noticeably lighter and faster-handling than a full mil-spec profile. This makes it ideal for hunters and shooters who want a practical, all-around rifle that won't wear you out during extended shooting or hunting without sacrificing durability or accuracy.

Is this barrel ready to install, or do I need additional parts?

The barrel itself is a complete unit, but installing it into an upper receiver requires an armorer's wrench, a barrel vise block, and installation expertise—or a gunsmith. You'll also need a gas block, gas tube, and other upper components if you're building from scratch. If you're replacing a barrel in an existing upper, a qualified gunsmith is your safest bet.

Does the nitride finish protect against rust and corrosion?

Yes. The nitride finish on both the inside and outside of the barrel provides excellent corrosion resistance and hardness, making it well-suited for extended shooting and storage in variable conditions. Proper maintenance and cleaning will keep it in top shape for years.