FN AR-15 M16 Barrel 16 Mid-Length 5.56mm
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FN America
Overview
The FN AR-15 M16 Barrel is a 16-inch M4-profile barrel designed for use with 5.56 NATO ammunition, featuring a mid-length gas system that provides a balance of reliability and reduced recoil. With a 1:7 twist rate, this barrel stabilizes a wide range of bullet weights, making it versatile for different shooting applications. This barrel commonly appears in mid-length gas system builds chambered in 5.56 NATO, catering to builders seeking a reliable and accurate setup.
Specifications
August 2026 on GunPartPicker
FN America FN AR-15 M16 Barrel 16 Mid-Length 5.56mm was the third most added barrel on GunPartPicker in August 2026, behind the FAXON Firearms 16" 223 Wylde Match Barrel Stainless Steel Black, with about 4% of all barrels added to builds. That's its 2nd straight month at #3. Builds with this barrel are nearly all chambered in 5.56 NATO, nearly all on mid-length gas, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 6 of the 7 retailers we track have it in stock. The best price drifted down from $232.99 to $199.73 over August 2026 without a real sale. Buying today, the lowest price is $199.73 at KY Gun Company, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
The part most often added in each category by the 109 builds that include this one
Bravo Company M16 Bolt Carrier Group Black
Geissele Automatics G2S Two Stage AR-15 Trigger .154"
BCM GFHMK2MED Ambidextrous MK2 Charging Handle Compatible w/ Mil-Spec AR-15 Black 7075 T-6 Aluminum
PSA AR-15 "Stealth" Stripped Lower Receiver
Sons of Liberty Gun Works AR-15 Gas Tube Stainless Steel Mid-Length
Sons of Liberty Gun Works Gas Block V2 - .750"
Builds Featuring This Part
See all 1 →Builds in the community that include the Fn Ar-15 M16 Barrel 16 Mid-Length 5.56mm
| Build | Parts | Total |
|---|---|---|
 | 8 | $1358.65 |
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