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FN America
Overview
The FN AR-15 M16 Barrel features a 20-inch M4 profile designed for the 5.56 NATO caliber, making it a solid choice for precision shooting and long-range performance. With a rifle-length gas system and a 1:7 twist rate, this barrel stabilizes a wide range of bullet weights, enhancing accuracy and reliability. You'll often find this barrel in builds that prioritize longer distances and enhanced gas efficiency, ideal for competitive shooting or tactical applications.
Specifications
October 2026 on GunPartPicker
FN America FN AR-15 M16 Barrel 20 Rifle Length 5.56mm ranked #131 of the 329 barrels builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #135 of the 1,044 barrels builders have added.
It was out of stock everywhere we track every time we checked in October 2026, and today none of the 3 retailers we track has it in stock right now. Listed prices start at $241.99 at KY Gun Company for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Read the guide: AR-15 Barrel Length & Brand Report →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4
Midwest Industries Quad Rail AR-15 Handguard - 15"
Strike Industries Arch AR-15 Charging Handle Standard Latch - Black
Bravo Company M16 Bolt Carrier Group Black
Wilson Combat AR-15 Rifle Length Gas Tube Stainless Steel
HK MR 5.56 TRIGGER
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the Fn Ar-15 M16 Barrel 20 Rifle Length 5.56mm
| Build | Parts | Total |
|---|---|---|
 | 12 | $1044.69 |
 | 10 | $980.33 |
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