FN Barrel AR-15 Pistol 5.56x45mm 14.7" M4 Contour Carbine Length Gas Port 1 in 7" Twist Hammer Forged Chrome Lined Chrome Moly Matte
$349.00
- Caliber-Gauge:
- 223 Remington / 5.56 NATO
- Barrel Length:
- 14.7"
- Barrel Length Range:
- 14" to 14.99"
- Model:
- AR-15
- Barrel Type:
- Carbine Length
- Barrel Features:
- Chrome-Lined
The FN AR-15 Pistol barrel in 5.56x45mm is engineered for shooters building short-barreled rifle (SBR) uppers who demand durability without compromise. This 14.7" M4 contour barrel combines FN's military-grade manufacturing with features that extend service life and maintain reliability through high volumes of fire. Whether you're assembling a dedicated pistol-caliber upper, a short-range trainer, or a compact defensive platform, this barrel delivers the consistency FN is known for in fielded weapons systems.
Built from hammer-forged Chrome Moly Vanadium steel—the same material FN uses in machine gun barrels designed to absorb sustained automatic fire—this barrel starts with a metallurgical advantage. After forging, each barrel undergoes magnetic particle inspection to screen out microscopic stress risers and inclusions that could cause premature failure. The bore and chamber are chrome lined, a coating that resists corrosion and heat erosion, meaningfully extending barrel life and ensuring reliable feeding and extraction through thousands of rounds. The M4 feed ramp geometry provides the feeding consistency you'd expect from a professional manufacturer.
Externally, the matte-finish Manganese Phosphate coating protects against rust and oxidation without the snag risk of aggressive texturing. The 1:7 twist rate stabilizes a range of 5.56 projectiles, from lighter varmint loads to heavier match and duty rounds. At 14.7 inches, this carbine-length barrel threads standard AR-pattern components and fits compact upper receivers for the SBR configuration you're building.
Key Features
- Hammer-forged Chrome Moly Vanadium steel—same military-spec material as FN machine gun barrels
- Magnetic Particle inspection for micro-stress detection and consistency
- Chrome-lined bore and chamber for corrosion resistance and extended barrel life
- M4 feed ramps and barrel extension for reliable feeding
- Matte Manganese Phosphate finish resists corrosion and oxidation
- 1:7 twist rate
- Carbine-length gas system
- 14.7" M4 contour
Specifications
| Caliber | 5.56x45mm |
| Barrel Length | 14.7" |
| Contour | M4 |
| Twist Rate | 1:7 |
| Gas System Length | Carbine |
| Bore/Chamber Lining | Chrome Lined |
| Material | Hammer-Forged Chrome Moly Vanadium Steel |
| External Finish | Matte Manganese Phosphate |
| Feed Ramp Style | M4 |
| Manufacturer | FN AMERICA |
Frequently Asked Questions
What SBR and short-barreled upper configurations does this barrel fit?
This is a standard AR-15 threaded barrel with M4 contour and geometry. It threads into standard AR-pattern upper receivers with carbine-length gas systems. Verify your upper receiver's specifications match before ordering.
Why is the chrome lining important?
Chrome lining resists corrosion from moisture and the chemical byproducts of firing, and it reduces heat erosion of the bore. This extends barrel life, keeps the chamber function reliable, and is especially valuable if your rifle sees frequent use or inconsistent storage conditions.
What twist rate stabilizes?
The 1:7 twist stabilizes a broad range of 5.56 projectiles, from lighter varmint and training loads to heavier match-grade and duty ammunition.
Is this barrel finished and ready to install?
Yes—the barrel is complete, chrome lined, and finished. You will need appropriate upper receiver components (bolt carrier group, gas tube, handguard) and installation tools to assemble it into an upper.
