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FN's 14.7-inch M4 carbine barrel hits that sweet spot between the compact handling you want and the velocity you need out of a 5.56 round. This barrel works with both 5.56 NATO and .223 Remington ammunition, so you've got flexibility in what you shoot without any modifications.
Button rifling creates exceptionally smooth, consistent rifling grooves that FN executes to military specifications. The barrel is forged from chrome moly vanadium steel per Mil-B-11595E, then high pressure tested (HPT) and magnetic particle inspected (MPI) to catch any internal flaws before it ships. That means every barrel that leaves the factory has been proven to be free of micro-stresses and defects. The fit and finish across these barrels is really tight because of how controlled the button rifling process is.
The bore and chamber are fully chrome-lined, which matters more than people think. You get genuine corrosion resistance that protects the barrel from humidity, fouling, and the wear that comes from high-volume shooting. The chrome lining also reduces throat erosion, which keeps the barrel accurate for thousands of rounds. Pair that with the matte black manganese phosphate exterior finish, and you've got a barrel that resists rust from the inside out. This setup is why militaries have relied on chrome-lined barrels for decades.
The 14.7-inch length keeps things maneuverable while giving you enough velocity for solid 200-plus-yard performance. M4-style feed ramps ensure consistent feeding, and the carbine-length gas system is standard for most AR uppers you'll run into. The 1:7 twist handles everything from light 55-grain FMJ rounds to heavier match ammunition. The muzzle is threaded 1/2×28, so you can thread suppressors, flash hiders, or brakes if you want to customize the platform.
Yes. This barrel is designed for standard AR-15 platforms and will work with any upper that accepts a barrel with carbine-length gas system and .750 gas block diameter. You'll want to verify your receiver is mil-spec compatible, but it fits the vast majority of AR builds out there.
Absolutely. The 5.56 NATO chamber safely handles both 5.56 NATO and .223 Remington ammunition, so you've got flexibility in what you stock. This is one of the practical advantages of the 5.56 chamber over other options.
Chrome lining significantly extends barrel life by reducing wear from repeated firing and protecting against corrosion from moisture and fouling. It's also easier to clean because fouling doesn't stick as readily to the smooth chrome surface. This makes it ideal if you run high volumes or need reliable performance in harsh environments.
Button rifling uses a broach tool pushed through the barrel to form the grooves rather than cutting or forging them. FN's button-rifled barrels are known for consistency and smooth rifling, which supports accuracy. This method has been the military standard for M16 and M4 barrels for years, and it delivers proven reliability.
| UPC | 845737008567 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20-100044 |
| Barrel Length | 14.7" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 23 |
| Model | |
| Package Height | 2.4 |
| Package Width | 2.5 |
| Product Type | Accessory-Barrels |
| Shipping Weight | 1.85 |
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