FAXON Firearms AR-15/M16 14.5 Pencil Barrel 4150 QPQ Mid .625
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Faxon Firearms
Overview
The Faxon Firearms AR-15/M16 14.5 Pencil Barrel is designed for builders looking to optimize their lightweight setups without sacrificing performance. This barrel features a mid-length gas system, which helps to reduce recoil and improve cycling, paired with a 1:8 twist rate that stabilizes a wide range of 5.56 NATO ammunition. Its .625 gas block diameter allows for compatibility with slim profile gas blocks, making it a popular choice for builds seeking a balance of weight and functionality.
Specifications
FAXON Firearms AR-15/M16 14.5 Pencil Barrel 4150 QPQ Mid .625
Build history on GunPartPicker
Builders have been adding the FAXON Firearms AR-15/M16 14.5 Pencil Barrel 4150 QPQ Mid .625 to their builds on GunPartPicker since February 2026. All time, it ranks #185 of the 815 barrels builders have added. Builds with this barrel are nearly all chambered in 5.56 NATO, nearly all on mid-length gas, and mostly AR-15 (83%, then AR-10 17%).
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 5 of the 6 retailers we track have it in stock. The best price crept up from $151.99 to $161 over August 2026. Buying today, the lowest price is $161 at Brownells, above August's low of $151.99, so a better deal may come back.
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 12 builds that include this one
Zro Delta AR-15 Forged M4 Stripped Upper Receiver
BLEM PSA AR-15 Lower Safe/Fire
Guntec USA AR-15 Ambidextrous Quick Engage Charging Handle Anodized Bronze
WMD Guns M16 NIB-X® Bolt Carrier Group W/ Hammer
FAXON Streamline Carbon Fiber M-LOK AR-15 Handguard - 13"
Zro Delta AR-15 Fire Control Group Laser Cut Disconnector
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 2 →Builds in the community that include the Faxon Firearms Ar-15/m16 14.5 Pencil Barrel 4150 Qpq Mid .625
| Build | Parts | Total |
|---|---|---|
 | 6 | $908.93 |
 | 14 | $782.24 |
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