Availability: In Stock
The FN Barrel AR-15 16" 5.56 NATO with M4 contour, carbine gas, and 1:7 twist is a hammer-forged, chrome-lined barrel built on the same manufacturing principles that have armed U.S. military forces for over a century. FN America's cold-hammer-forging process creates a stronger, more durable bore than button-rifled alternatives—a difference that matters when you're pushing your AR hard at the range, in competition, or in the field. The chrome-lined bore and chamber resist corrosion and heat cycling, extending barrel life even through high-round-count sessions. This is a mil-spec barrel designed to work reliably in standard AR-15 receivers without fussing.
The 16-inch length and carbine-length gas system strike a practical balance: short enough for close-quarters handling, long enough to wring good velocity from 5.56 NATO rounds. The 1:7 twist rate stabilizes a wide range of bullet weights, from 55-grain varmint loads to heavier 77-grain match ammunition. M4-style feed ramps ensure smooth, reliable feeding with any quality magazine and ammunition combination. A manganese-phosphate finish protects the steel from the elements and wear, and every barrel undergoes magnetic-particle inspection at the factory to catch any hidden flaws before it ships.
If you're building or upgrading an AR carbine and want a barrel with genuine pedigree—one forged to military standards but available to civilian shooters—FN's hammer-forged design gives you confidence that you're not running a compromise. Whether you're an AR enthusiast, a shooter who values durability, or someone who simply prefers barrels with a proven track record, this is the real thing.
| Caliber | 5.56 NATO |
| Barrel Length | 16 inches |
| Contour | M4 |
| Twist Rate | 1:7 inches |
| Gas System | Carbine-length |
| Bore & Chamber Lining | Chrome-lined |
| Forging Method | Cold-hammer-forged |
| Feed Ramps | M4-style |
| Finish | Manganese-phosphate |
| Manufacturer | FN America |
This barrel is designed for mil-spec AR-15 receivers. The M4-style feed ramps and standard threading ensure compatibility with any standard AR-15 platform.
The FN barrel features a 1:7 twist rate, which stabilizes a broad range of 5.56 NATO bullet weights from 55-grain varmint rounds through 77-grain match-grade ammunition.
The chrome-lined bore and chamber resist corrosion from moisture and the corrosive byproducts of firing, and they handle heat cycling better than unlined barrels. This extends barrel life and makes cleaning and maintenance easier, especially if you shoot high volume or in harsh conditions.
Cold-hammer-forging compresses the steel and creates a denser, stronger barrel than button-rifling does. This manufacturing method is why FN's military barrels are trusted for sustained fire and hard use—the process itself makes the barrel more durable.
SKU: 115822772 • Width: 2.5in • Height: 2.3in • Depth: 22.9in • Weight: 2.02oz
Availability: In Stock
The FN Barrel AR-15 16" 5.56 NATO with M4 contour, carbine gas, and 1:7 twist is a hammer-forged, chrome-lined barrel built on the same manufacturing principles that have armed U.S. military forces for over a century. FN America's cold-hammer-forging process creates a stronger, more durable bore than button-rifled alternatives—a difference that matters when you're pushing your AR hard at the range, in competition, or in the field. The chrome-lined bore and chamber resist corrosion and heat cycling, extending barrel life even through high-round-count sessions. This is a mil-spec barrel designed to work reliably in standard AR-15 receivers without fussing.
The 16-inch length and carbine-length gas system strike a practical balance: short enough for close-quarters handling, long enough to wring good velocity from 5.56 NATO rounds. The 1:7 twist rate stabilizes a wide range of bullet weights, from 55-grain varmint loads to heavier 77-grain match ammunition. M4-style feed ramps ensure smooth, reliable feeding with any quality magazine and ammunition combination. A manganese-phosphate finish protects the steel from the elements and wear, and every barrel undergoes magnetic-particle inspection at the factory to catch any hidden flaws before it ships.
If you're building or upgrading an AR carbine and want a barrel with genuine pedigree—one forged to military standards but available to civilian shooters—FN's hammer-forged design gives you confidence that you're not running a compromise. Whether you're an AR enthusiast, a shooter who values durability, or someone who simply prefers barrels with a proven track record, this is the real thing.
| Caliber | 5.56 NATO |
| Barrel Length | 16 inches |
| Contour | M4 |
| Twist Rate | 1:7 inches |
| Gas System | Carbine-length |
| Bore & Chamber Lining | Chrome-lined |
| Forging Method | Cold-hammer-forged |
| Feed Ramps | M4-style |
| Finish | Manganese-phosphate |
| Manufacturer | FN America |
This barrel is designed for mil-spec AR-15 receivers. The M4-style feed ramps and standard threading ensure compatibility with any standard AR-15 platform.
The FN barrel features a 1:7 twist rate, which stabilizes a broad range of 5.56 NATO bullet weights from 55-grain varmint rounds through 77-grain match-grade ammunition.
The chrome-lined bore and chamber resist corrosion from moisture and the corrosive byproducts of firing, and they handle heat cycling better than unlined barrels. This extends barrel life and makes cleaning and maintenance easier, especially if you shoot high volume or in harsh conditions.
Cold-hammer-forging compresses the steel and creates a denser, stronger barrel than button-rifling does. This manufacturing method is why FN's military barrels are trusted for sustained fire and hard use—the process itself makes the barrel more durable.
SKU: 115822772 • Width: 2.5in • Height: 2.3in • Depth: 22.9in • Weight: 2.02oz