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FN knows a thing or two about barrels. The company has been forging them for the U.S. military for decades, and this 14.7-inch M4 profile barrel carries that same reputation into your own build. Chambered for both 5.56 NATO and .223 Remington, it hits a nice middle ground between the shorter overall length you want for handling and the muzzle velocity you get out of a longer tube. That extra length past a 14.5-inch barrel also opens up some interesting options at the muzzle if you're planning to pin and weld a flash hider.
The barrel is machined from U.S.-sourced Chrome Moly Vanadium steel built to the Mil-B-11595E spec, which is the same class of material FN leans on for its heavy-use barrels. Every one gets high pressure tested and magnetic particle inspected so it leaves the factory free of micro-stresses and flaws. The bore and chamber are chrome lined, which does real work over the life of the barrel by fighting off corrosion, standing up to heat erosion, and keeping chambering and extraction smooth round after round.
This one uses button rifling with a 1:7 right-hand twist, which stabilizes the heavier bullet weights a lot of folks run these days without giving up performance on lighter loads. It runs a carbine-length gas system and M4-style feed ramps cut into the barrel extension, so cycling stays consistent across a wide range of ammo. The muzzle is threaded 1/2×28, standard for the caliber, so your existing brakes, flash hiders, and suppressor mounts thread right on.
The matte black manganese phosphate finish shrugs off external corrosion and gives it that no-nonsense military look. It drops into any standard AR-15 upper, whether you're starting a fresh build or upgrading the heart of something you already own. If you want a barrel with genuine pedigree behind it rather than a no-name blank, this is a solid piece to build on.
This barrel is cut with a 1:7 right-hand twist, which is the military standard for 5.56 NATO. That rate does a great job stabilizing heavier bullet weights like 62 to 77 grain loads while still shooting lighter ammo well. It gives you flexibility to run a wide range of factory and match ammunition.
Yes, it drops into any standard AR-15 upper receiver and barrel nut setup. It uses M4-style feed ramps in the barrel extension, so pairing it with an M4-cut upper gives you the smoothest feeding. The 1/2×28 threaded muzzle also accepts standard 5.56 muzzle devices and suppressor mounts.
The 14.7-inch length gives you slightly more velocity and dwell time than a 14.5-inch barrel while keeping the compact handling that makes carbines so easy to run. It's a popular choice for builders who plan to pin and weld a muzzle device to reach an overall length without going shorter. You still get carbine-length gas timing for reliable cycling.
It is. Both the bore and chamber are chrome lined, which helps resist corrosion and heat erosion while extending barrel life. Chrome lining also keeps chambering and extraction reliable over a lot of rounds, which is a big reason FN uses it on their military-grade barrels.
| UPC | 845737008567 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20100044 |
| Barrel Length | 14.7" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 14.70" |
| Model | |
| Package Height | 2.4 |
| Package Width | 2.5 |
| Product Type | Accessory-Barrels |
| Shipping Weight | 1.85 |
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