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Faxon Firearms
Overview
The Faxon Firearms AR-15/M16 16" Pencil Barrel is designed for builders looking to create a lightweight and maneuverable rifle without sacrificing accuracy. With a mid-length gas system and a twist rate of 1:8, this barrel optimizes performance for 5.56 NATO ammunition, ensuring reliable cycling and effective stabilization of a variety of projectile weights. This barrel is commonly found in lightweight builds where agility and speed are prioritized, making it a great choice for competitive shooting or dynamic applications.
Specifications
FAXON Firearms AR-15/M16 16 Pencil Barrel 4150 QPQ Mid .625
Available Merchants(8)
Prices checked
Price Alert
October 2026 on GunPartPicker
FAXON Firearms AR-15/M16 16 Pencil Barrel 4150 QPQ Mid .625 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 #201 of the 1,049 barrels builders have added.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today all 8 retailers we track have it in stock. Prices barely moved in October 2026, holding around $173, with no real sale all month. Buying today, the lowest price is $159.16 at AT3 Tactical, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
FAB Defense Tactical Folding Pistol Grip, Black - AGF-43S
ODIN Works Rune Free Float M-LOK AR-15 Handguard - 15"
WMD Guns AR-15 Gas Tube Nitromet Mid-Length
Radian Weapons Talon Ambidextrous Safety Selector 2-Lever KIT - Radian Grey
FMK AR-1 .223 Remington AR Lower, Blue - FMKGAR1ETB
Superlative Arms Solid Set Screw Adjustable Bleed Off Gas Block .625in Solid Set Screw Stainless Steel DLC Tan Finish Tan
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 Faxon Firearms Ar-15/m16 16 Pencil Barrel 4150 Qpq Mid .625
| Build | Parts | Total |
|---|---|---|
 | 17 | $1067.63 |
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