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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.
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.
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.
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.
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.
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.
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.
| UPC | 845737005146 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 36423 |
| Length | 18" |
| Model |
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