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FN barrels have earned their reputation through decades of supplying the military, and this 16-inch M4 carbine model brings that same level of quality to your AR build. It's made from U.S.-sourced Chrome Moly Vanadium steel per Mil-B-11595E standards and button rifled for precision. The chrome-lined bore and chamber resist corrosion and heat erosion, which extends barrel life and keeps your rounds feeding smoothly through the chamber.
The chrome lining is where this barrel shines if you plan to run suppressed ammo, high-volume training sessions, or just want a barrel that'll still shoot straight after thousands of rounds. This isn't a cosmetic upgrade either—it actually improves reliability of chambering and extraction, especially if you're mixing ammunition types. The M4 style feed ramps and barrel extension promote consistent feeding across different loads.
Every FN barrel leaves the factory after High Pressure Testing (HPT) and Magnetic Particle Inspection (MPI). This means each one is verified free of micro-stresses and hidden flaws that could cause problems downrange. The matte black manganese phosphate finish provides long-term corrosion resistance and won't wear off easily from handling or storage.
This barrel features a 1:7 right-hand twist rate, which stabilizes everything from lighter 55-grain rounds to heavier 77-grain match ammo. The 1/2 by 28 threaded muzzle accommodates suppressors, muzzle brakes, or flash hiders. With carbine-length gas system compatibility, this barrel pairs naturally with standard carbine uppers and runs predictably with a wide range of ammunition.
Yes. This is a standard M4 profile barrel with conventional M4-style feed ramps and barrel extension, so it will fit any AR-15 receiver designed for the cartridge. The 1/2×28 threads accept standard muzzle devices. We recommend having a qualified gunsmith perform the installation to ensure proper headspace and alignment.
Button rifled and hammer-forged barrels both produce excellent results and this FN barrel goes through the same rigorous HPT and MPI testing you'd expect from factory-grade parts. Button rifling produces very consistent groove dimensions and is efficient to manufacture, while both methods yield barrels suitable for precision and duty use. The real deciding factor here is that it's an FN barrel—they've built barrels for military use for over a century.
Chrome lining significantly extends barrel life by protecting the bore and chamber from corrosion and heat erosion, which are the primary wear mechanisms in rifles fired frequently or with harsh conditions. It also improves extraction reliability. Accuracy is not negatively affected—the lining is applied after rifling and won't compromise precision when the barrel is properly maintained.
Absolutely. The 1:7 twist and chrome-lined bore handle everything from 55-grain training loads to 77-grain match ammunition reliably. The factory HPT and MPI testing means you're getting a barrel built to military specifications. Many users report great results at 300 yards and beyond with the right ammunition and optics setup.
| UPC | 845737008420 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20-100046 |
| Barrel Length | 16" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 23 |
| Model | |
| Package Height | 2.3 |
| Package Width | 2.3 |
| Product Type | Accessory-Barrels |
| Shipping Weight | 2.05 |
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