Hammer Forged AR-15 Hf M4 Barrel 16 Carbine 5.56mm
$269.99 at GunMag Warehouse · 6 stores
In stock
FN America .223 Rem/5.56 16" Carbine Barrel, Chrome Lined Black Phosphate - 36421
FN America · Barrels
No ratings yetBest price
$298.99at Palmetto State Armory
Out of stock not checked recently
In stock now instead
- Hammer Forged AR-15 Hf M4 Barrel 16 Carbine 5.56mm $269.99at GunMag Warehouse
- Hammer Forged AR-15 Hf M4 Barrel 14.7 Carbine 5.56mm $349.00at Ammunition Depot
- M4cqb Replacement Barrel Assembly 10.3in $298.49at Ammunition Depot
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Palmetto State Armory Best price | $298.99not checked recently | Out of stock | Buy at Palmetto State Armory | |
| Brownells | $329.99checked Oct 22, 2026 | Out of stock | Buy at Brownells |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
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This part is out of stock at every store we track. These similar barrels are in stock, with today's prices.
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Price history
Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $329.99 | $329.99 | $329.99 |
Since Sep 27, 2026.
About this part
The FN America .223 Rem/5.56 16" Carbine Barrel, Chrome Lined Black Phosphate - 36421 is a 16" 5.56 / .223 barrel from FN America with a carbine gas system. It's sold by 2 stores, from $298.99 to $329.99.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Gas system
- Carbine · Handguards
- Barrel length
- 16" · Handguards
Specifications
- Manufacturer
- FN America
- Platform
- AR-15
- Barrel length
- 16"
From the manufacturer
FN AR-15 Hammer-Forged Barrels have a chrome-lined chamber and bore to help resist corrosion and provide heat erosion resistance. There barrel is forged from Chrome Moly Vanadium steel and built for the .750" diameter gas block with 1/2x28" threaded muzzle. It has an M4-style feed ramp and barrel extension for consistent and reliable feeding. This barrel is chambered in 5.56 NATO with a 1:7" twist with a manganese phosphate finish.
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