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FN has been cranking out barrels for the U.S. military for decades, and this 16-inch M4 carbine barrel is cut from the same cloth as the ones going onto issued M4 and M16 rifles. If you want a build with real pedigree behind it instead of a no-name blank, this is about as legit as it gets in the AR world.
The barrel starts as U.S.-sourced Chrome Moly Vanadium steel made to the Mil-B-11595E spec, the same grade of steel FN uses in machine gun barrels built to survive sustained full-auto fire. Every barrel gets high pressure tested and magnetic particle inspected at the factory, which is the process that catches microscopic flaws and stresses before a barrel ever ships. The bore and chamber are chrome lined, so it shrugs off corrosion and heat erosion while making cleaning and reliable extraction a whole lot easier over the long haul.
This is a carbine-length gas system with a .750 gas seat, an M4 profile with M4 style feed ramps machined into the barrel extension, and a 1/2×28 threaded muzzle for whatever brake, flash hider, or can you want to run. The 1:7 right-hand twist is the military standard and it stabilizes everything from lightweight 55-grain plinking ammo up through heavier 62 and 77-grain match and defensive loads without complaint.
Keep in mind this ships as a stripped barrel. There's no gas block, gas tube, barrel nut, or muzzle device in the box, so you'll want those parts on hand before you start assembly. The finish is a matte black manganese phosphate that holds up well against the elements and matches the look of a classic military carbine. Whether you're putting together a first AR or upgrading a parts-bin build to something with serious lineage, this barrel gives you a foundation you can trust round after round.
This particular barrel is button rifled, not cold hammer forged. Button rifling is the same method FN and other military contractors like Colt and LMT have used for standard-issue barrels for years. It's a proven, accurate process that produces a consistent, durable bore.
No, it ships as a stripped barrel. You'll need to add your own gas block, gas tube, barrel nut, and muzzle device separately. The .750 gas seat takes a standard gas block and the 1/2×28 muzzle threads accept most common flash hiders, brakes, and suppressors.
The 1:7 twist is the military standard and it's the most versatile option out there for 5.56 and .223. It stabilizes lighter 55-grain loads just fine while really shining with heavier 62 to 77-grain projectiles, including match and defensive ammo. If you plan to run a variety of loads, this twist rate has you covered.
Yes, it uses a standard M4-pattern barrel extension and drops into any mil-spec AR-15 upper receiver. The carbine-length gas system means you'll want a carbine gas tube and a handguard sized to match. Feed ramps are the M4 style, so pair it with an M4 feed ramp upper for the cleanest 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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