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FN 36423 AR-15 Barrel 5.56 NATO 18″ Rifle-Length Hammer Forged

UPC: 845737005146

$349.00

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Description

FN doesn't cut corners on barrels, and the 36423 is a good example of why they've held military contracts for so long. This 18-inch barrel is cold hammer-forged from FN's proprietary high-grade Chrome Moly Vanadium steel, the same material they use in their machine gun barrels that are built to take the beating of sustained full-auto fire. Every barrel gets magnetic particle tested after forging to catch any micro-stresses or flaws before it ever leaves the factory, which is a big part of why FN barrels have such a consistent reputation.

What the 18" FN 36423 Brings to a Build

The 18-inch length paired with a rifle-length gas system is a sweet spot for a lot of builders. You get extra velocity over a 16-inch carbine while the longer gas system smooths out the cycling and softens felt recoil, which helps with quick follow-up shots. It runs a 1:7 right-hand twist, so it stabilizes everything from lighter 55-grain loads up through heavier 62 to 77-grain match projectiles without a fuss.

Fit and Finish on the FN Hammer-Forged Barrel

This one is cut to a government profile and built for a standard .750-inch gas block, with a 1/2×28 threaded muzzle so you can add a flash hider, brake, or suppressor mount without any extra machining. The bore and chamber are chrome-lined to resist corrosion and heat erosion, which stretches barrel life and keeps chambering and extraction reliable. M4-style feed ramps and barrel extension come cut into it for smooth feeding, and the exterior wears a matte black manganese phosphate finish that fights off rust and oxidation.

It's a factory FN-15 barrel that drops into any mil-spec AR-15 or clone upper, making it a straightforward upgrade or replacement for a rifle-length precision build.

Key Specifications

  • Manufacturer: FN America / FN Herstal
  • Manufacturer Part Number: 36423
  • Model: AR-15
  • UPC: 845737005146
  • Caliber: 5.56x45mm NATO / .223 Remington
  • Barrel Length: 18"
  • Gas System: Rifle-Length
  • Twist Rate: 1:7 RH
  • Profile: Government
  • Construction: Cold Hammer-Forged Chrome Moly Vanadium (CMV) Steel
  • Bore/Chamber: Chrome-Lined
  • Muzzle Thread: 1/2×28
  • Gas Block Diameter: .750"
  • Feed Ramps: M4-Style
  • Finish: Matte Black Manganese Phosphate
  • Weight: Approx. 2.7 lbs

What’s Included

  • FN 36423 18" AR-15 barrel

Frequently Asked Questions

Will the FN 36423 barrel fit any AR-15 upper?

Yes. This is a factory FN-15 barrel that drops into any mil-spec AR-15 or clone upper receiver. It's built for a standard .750-inch gas block and uses M4-style feed ramps, so it works with a normal mil-spec build.

What ammo works best with the 1:7 twist on this FN barrel?

The 1:7 right-hand twist is a versatile choice that handles a wide window of bullet weights. It stabilizes lighter 55-grain loads and really shines with heavier 62 to 77-grain projectiles, including match ammo, making it a solid pick for both plinking and precision work.

Why choose the 18-inch rifle-length gas system over a 16-inch carbine?

The extra two inches of barrel gives you a bit more velocity, and the rifle-length gas system meters gas more gently. That translates to smoother cycling and softer felt recoil, which many builders prefer for accuracy-focused rifles.

Is the FN 36423 barrel threaded for a muzzle device?

It is. The muzzle comes cut with standard 1/2×28 threads, so you can add a flash hider, muzzle brake, compensator, or suppressor mount without any extra machining.

Additional information

UPC

845737005146

Manufacturer

Manufacturer Part Number

36423

Length

18"

Model

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