FAXON Firearms AR-15 Gunner Barrel, 18", 5.56 NATO, Rifle Length, 4150 QPQ
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Faxon Firearms
Overview
The Faxon Firearms AR-15 Gunner Barrel is an 18-inch pencil profile barrel designed for the 5.56 NATO caliber, offering a lightweight option for your build. With a rifle-length gas system and a twist rate of 1:8, this barrel is optimized for stability and accuracy, making it suitable for a variety of ammunition types. You’ll commonly find this barrel in builds that prioritize lightweight configurations while maintaining reliable cycling and performance in 5.56 NATO setups.
Specifications
FAXON Firearms AR-15 Gunner Barrel, 18", 5.56 NATO, Rifle Length, 4150 QPQ
Build history on GunPartPicker
Builders on GunPartPicker first added the FAXON Firearms AR-15 Gunner Barrel, 18", 5.56 NATO, Rifle Length, 4150 QPQ to a build in February 2026.
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 crept up from $174 to $179.40 over August 2026. Buying today, the lowest price is $174 at Optics Planet, 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 9 builds that include this one
Yankee Hill Machine .223 Rem/5.56 Flat Top Stripped Upper Receiver, Hardcoat Anodized Matte Black - 110
Aero Precision Stripped M4E1 AR-15 Lower Receiver - Special Edition - Freedom
Battle Arms Development Rack Ambidextrous AR-15 Charging Handle - Mod C
Cryptic Coatings 5.56 NATO AR-15 Bolt Carrier Group - Mystic Bronze
Yankee Hill Machine Co. AR-15 Gas Tube Black Rifle
Daniel Defense AR-15/M16 DDM4 Lite Rail 15"
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 4 →Builds in the community that include the Faxon Firearms Ar-15 Gunner Barrel, 18", 5.56 Nato, Rifle Length, 4150 Qpq
| Build | Parts | Total |
|---|---|---|
 | 16 | $1821.51 |
 | 10 | $929.19 |
 | 17 | $1450.78 |
 | 19 | $1470.93 |
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