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There's a reason FN barrels show up on so many serious builds, and this 14.7" M4 carbine barrel is a good example of why. It's cold hammer-forged from FN's proprietary high-grade Chrome Moly Vanadium steel, the same material and process they use on the machine gun barrels built to survive sustained automatic fire. That kind of pedigree isn't marketing fluff here. You're getting a barrel engineered to outlast the rest of your rifle.
After forging, every barrel gets magnetic particle inspected to catch any micro-stresses or flaws before it ever leaves the factory. The bore and chamber are both chrome-lined, which fights corrosion, resists heat erosion, and keeps chambering and extraction smooth round after round. The exterior wears a matte black manganese phosphate finish that shrugs off rust and general abuse. It's the kind of barrel you bolt on once and forget about.
This one is chambered in 5.56 NATO (so it happily runs .223 Remington too) with a 1:7 right-hand twist that stabilizes everything from lightweight 55-grain loads up through heavier match bullets. It uses a carbine-length gas system and rides an M4 profile with M4-style feed ramps for reliable feeding. The muzzle is threaded 1/2×28, so your favorite flash hider, brake, or can threads right on, and it's cut for a standard .750" gas block.
The 14.7" length gives you a shorter, handier package than a full 16" without giving up much velocity, which makes it a favorite for clone builds and anyone chasing that classic M4 feel. FN has spent years building barrels for the U.S. military, and that experience shows in the consistency and durability you get here. Pair it with a quality gas block and muzzle device and you've got the foundation for a rifle that shoots straight and runs hard for a long time.
It's chambered in 5.56 NATO, so it also runs .223 Remington safely, with a 1:7 right-hand twist. That twist stabilizes a wide range of bullet weights, from lighter 55-grain FMJ up through heavier match loads. It's the same spec FN uses on its military-pattern barrels.
This barrel runs a carbine-length gas system paired with the M4 profile. You'll want a carbine-length gas tube and a gas block sized for the .750" journal to complete it. It's a classic setup that's easy to source parts for.
Yes. The muzzle is threaded 1/2×28, which is the standard for 5.56 AR-15 barrels, so most flash hiders, brakes, and suppressor mounts will thread right on. Many builders pin and weld a muzzle device to this length to reach an overall barrel length of 16 inches.
Cold hammer forging shapes the bore and rifling by pounding the steel around a mandrel under extreme pressure, which is the same process FN uses on its machine gun barrels. It produces a very dense, consistent, and durable bore. In practice, a quality chrome-lined CHF barrel like this one delivers excellent barrel life and dependable accuracy.
| UPC | 845737011147 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20100405 |
| Length | 14.70" |
| Model |
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