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FN has been manufacturing barrels for over a century, and their experience shows in the 36420. This cold hammer forged barrel is made from proprietary Chrome Moly Vanadium steel, the same material FN uses in their machine gun barrels built to handle sustained fully automatic fire. That level of durability translates to a barrel that can handle hard use without compromise.
After forging, each barrel undergoes Magnetic Particle testing to verify it's free of micro-stresses and flaws. The chrome-lined bore and chamber resist corrosion and provide superior heat erosion resistance, which extends barrel life and maintains reliable chambering and extraction even under demanding conditions. The government profile contour balances weight and strength, while the matte black manganese phosphate finish protects against external corrosion and oxidation.
This carbine-length barrel ships with M4-style feed ramps and a barrel extension, ensuring consistent and reliable feeding with a wide variety of ammunition. The 1:7 right-hand twist accommodates everything from lighter 55-grain rounds to heavier projectiles, giving you flexibility in your ammunition choices. With a 1/2×28 threaded muzzle, you can easily attach suppressors or flash hiders. The .750 diameter gas block journal is built to standard mil-spec dimensions, making it compatible with any standard gas block.
A 14.5" barrel in a carbine-length gas system is the proven standard because it balances velocity, handling, and reliability. Chrome-lined barrels from quality manufacturers typically deliver 1.5-2.5 MOA accuracy with standard ammunition, and that performance is more than adequate for defensive work, training, and recreational shooting out to several hundred yards. The cold hammer forging process ensures tight tolerances between the bore and chamber, which contributes to reliability and consistency.
Yes, the 36420 is a drop-in barrel designed for any standard AR-15 or AR-15 clone. The government profile and .750 gas block diameter meet mil-spec standards, so it works with any standard upper receiver and carbine-length gas block without modification.
Yes. The barrel is chambered for 5.56x45mm NATO, which safely fires both 5.56 NATO and .223 Remington ammunition. You can use either cartridge without concern, though the chamber dimensions are optimized for the 5.56 specification.
Chrome-lined barrels from quality manufacturers typically deliver 1.5 to 2.5 MOA accuracy with standard ammunition. That's plenty of precision for defensive work, training, and recreational shooting. For precision work, you may want a match-grade stainless steel barrel, but this barrel performs well for real-world applications.
Cold hammer forging creates a barrel through repeated forging strikes rather than cutting rifling into finished steel. This process creates tighter bore and chamber tolerances, greater strength, and excellent consistency between production units. It's the method FN uses in their military machine gun barrels, which is why FN barrels are known for durability and reliability.
| 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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