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FN has been turning out barrels for over a century, and they're the folks the U.S. military trusts to make M16 and M4 barrels. That pedigree is exactly what you're getting with the 36420. It's cold hammer forged from FN's proprietary Chrome Moly Vanadium steel, the same material they use in machine gun barrels built to survive sustained full-auto fire. Translation for the rest of us: this thing will outlast most builds it gets bolted into.
Cold hammer forging is more than a buzzword here. The process hammers the steel around a mandrel under tremendous pressure, which creates a denser, tougher structure and tighter tolerances between the bore and chamber. After forging, every barrel gets magnetic particle tested to confirm it's free of micro-stresses or hidden flaws before it ever leaves the factory. The bore and chamber are both chrome lined, which fights corrosion, shrugs off heat erosion, and makes cleanup a whole lot easier at the end of a range day.
This one runs a 14.5" government profile with a carbine-length gas system, a 1:7 twist that stabilizes heavier bullets nicely, and a .750" gas block journal. The muzzle is threaded 1/2×28, so your favorite flash hider, comp, or brake threads right on. M4-style feed ramps and barrel extension keep feeding smooth and consistent, and the matte black manganese phosphate finish handles the corrosion resistance on the outside.
The 14.5" length is the classic M4 configuration, and it pairs beautifully with a carbine gas system since the longer dwell time keeps cycling reliable across a wide range of ammo. It's a favorite base for duty-style and hard-use carbine builds where you want military-grade parts without piecing together a full upper. Bolt on a gas block, muzzle device, and handguard, and you've got a barrel worth building a rifle around.
No, the 36420 ships as a bare barrel only. You'll need to supply your own carbine-length gas tube, a .750" gas block, and a muzzle device to complete the build. The muzzle is threaded 1/2×28, so standard 5.56 flash hiders, comps, and brakes thread right on.
It runs a 1:7 right-hand twist paired with a carbine-length gas system. The 1:7 stabilizes heavier bullets well, including 62 to 77 grain loads, while still shooting lighter stuff fine. The carbine gas system's longer dwell time on a 14.5" barrel keeps cycling reliable across a broad range of ammo.
The 36420 has a chrome-lined bore and chamber, not a nitride finish. Chrome lining is prized for its corrosion resistance, heat erosion resistance, and long service life under hard use, and it makes cleaning easier. The exterior is finished in matte black manganese phosphate for outside corrosion protection.
Yes. It uses a standard .750" gas block journal, M4-style feed ramps and barrel extension, and a mil-spec 1/2×28 muzzle thread, so it drops into a standard AR-15 upper with common parts. Just match it with a carbine-length gas tube since that's the gas system this barrel is set up for.
| UPC | 845737005115 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 36420 |
| Barrel Length | 14.5" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 23 |
| Model | |
| Package Height | 2.0 |
| Package Width | 2.5 |
| Product Type | Accessory-Barrels |
| Shipping Weight | 1.95 |
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