FAXON Firearms AR-15 Gunner Barrel, 20", 5.56 NATO, Rifle Length, 4150 QPQ
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Faxon Firearms
Overview
The Faxon Firearms AR-15 Gunner Barrel is a 20-inch pencil-profile barrel designed for 5.56 NATO caliber, featuring a rifle-length gas system. With a twist rate of 1:8, this barrel effectively stabilizes a variety of bullet weights, making it versatile for different shooting applications. This barrel is typically found in builds focusing on precision and lightweight configurations, where a longer barrel length and efficient gas system are desired.
Specifications
FAXON Firearms AR-15 Gunner Barrel, 20", 5.56 NATO, Rifle Length, 4150 QPQ
Build history on GunPartPicker
Builders have been adding the FAXON Firearms AR-15 Gunner Barrel, 20", 5.56 NATO, Rifle Length, 4150 QPQ to their builds on GunPartPicker since February 2026. All time, it ranks #140 of the 812 barrels builders have added. Builds with this barrel are nearly all chambered in 5.56 NATO, nearly all on rifle-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 7 of the 9 retailers we track have it in stock. It dipped to $158.40 at Optics Planet for a stretch in August 2026, under its usual $165.99 to $176, so sales do come around. Buying today, the lowest price is $165.99 at Ammunition Depot.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 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 20 builds that include this one
Aero Precision AR-15 Stripped Upper Receiver, No Forward Assist Black
Aero Precision M16A4 Clone Lower Receiver
Bravo Company Manufacturing AR-15 Bolt Carrier Group - M16
Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black
Midwest Industries Quad Rail AR-15 Handguard - 15"
Wilson Combat AR-15 Rifle Length Gas Tube Stainless Steel
Builds Featuring This Part
See all 4 →Builds in the community that include the Faxon Firearms Ar-15 Gunner Barrel, 20", 5.56 Nato, Rifle Length, 4150 Qpq
| Build | Parts | Total |
|---|---|---|
 | 24 | $1643.64 |
 | 13 | $1149.44 |
 | 12 | $882.60 |
| 13 | $799.71 |
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