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FN has been turning out barrels for military contracts for a very long time, and that pedigree carries straight into this 16" mid-length. It is machined from U.S.-sourced Chrome Moly Vanadium steel built to the Mil-B-11595E spec, button rifled for a consistent bore, and finished in matte black manganese phosphate that resists corrosion and oxidation on the outside. Inside, the chamber and bore are chrome lined, which helps fight heat erosion and keeps chambering and extraction smooth round after round. The M16 government profile sits under a .750 gas block journal, and the muzzle comes threaded 1/2×28 so you can drop on the flash hider, comp, or suppressor mount you already have in mind.
The mid-length gas system is the big draw here, and it is the reason a lot of folks spec this barrel for a 16" build. The gas port sits farther down the barrel than a carbine system, which stretches out dwell time and softens the recoil impulse. That means a smoother push into your shoulder, less muzzle rise between shots, and reduced wear on the bolt carrier group and buffer spring over the long haul. On a 16" barrel it is widely considered the sweet spot, giving you comfortable, reliable cycling without any fuss. The 1:7 right-hand twist stabilizes the heavier 62-grain and up 5.56 loads that most people run today, while still handling lighter .223 without complaint.
Every one of these barrels is High Pressure Tested and Magnetic Particle Inspected before it leaves the factory. That HPT and MPI process confirms the steel is free of micro-stresses and hidden flaws, so the barrel you bolt into your upper delivers the consistency FN is known for. It ships as a virgin, stripped barrel with FN markings and M4-style feed ramps machined into the barrel extension. Whether you are refreshing a duty-style carbine or laying the foundation for a fresh 5.56 build, this is a barrel that earns its keep at the range and beyond.
This barrel runs a 1:7 right-hand twist, which is the military standard for 5.56 NATO. It stabilizes heavier bullets in the 62-grain and up range best, including common green-tip loads, while still shooting lighter .223 rounds just fine. If you plan to feed it a mix of ammo, the 1:7 gives you the most flexibility across bullet weights.
On a 16" barrel, the mid-length gas system is generally the preferred setup. The gas port sits farther down the barrel than a carbine system, which lengthens dwell time and gives you a softer recoil impulse, less muzzle rise, and reduced wear on your bolt carrier group and buffer spring. It is a smoother, more comfortable shooting experience without giving up reliable cycling.
No, this ships as a virgin, stripped barrel only. There is no gas block, gas tube, flash hider, or barrel nut included, so you will need to source those separately for your build. The muzzle is threaded 1/2×28 and the gas block journal is .750, so standard AR-15 components will fit right up.
Every barrel is High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) at the factory. Those two checks confirm the steel is free of micro-stresses and hidden flaws, which is the same process behind the barrels FN supplies to the military. That is a big part of why FN button rifled barrels have such a strong reputation for consistency.
| UPC | 845737008475 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20-100041 |
| Barrel Length | 16" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Black |
| Length | 16" |
| Model | |
| Package Height | 2.3 |
| Package Width | 2.3 |
| Product Type | Barrel |
| Shipping Weight | 2.05 |
| Sights | No |
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