FAXON Firearms AR-15/M16 16 Pencil Barrel 4150 QPQ Mid .625
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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
Build history on GunPartPicker
Builders have been adding the FAXON Firearms AR-15/M16 16 Pencil Barrel 4150 QPQ Mid .625 to their builds on GunPartPicker since February 2026. All time, it ranks #374 of the 815 barrels builders have added.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 8 of the 9 retailers we track have it in stock. It dipped to $155.70 at Optics Planet for a stretch in August 2026, under its usual $170.20 to $173, so sales do come around. Buying today, the lowest price is $170.20 at Brownells, above August's low of $155.70, 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 5 builds that include this one
Phase 5 Tactical 15 Lopro Slope Nose Free Float Quad Rail With M-LOK Black
WMD Guns AR-15 Gas Tube Nitromet Mid-Length
Aero Precision Stripped M4E1 AR-15 Lower Receiver - Special Edition - Freedom
J P Enterprises AR-15 2-Pc Detent Gas Block Low Profile .750 Steel Black
Sons of Liberty Gun Works 5.56 M16 / AR-15 Bolt Carrier Group - Phosphate
Ergo Grips Ambidextrous Rigid Ergo Grip Polymer Black
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 1 →Builds in the community that include the Faxon Firearms Ar-15/m16 16 Pencil Barrel 4150 Qpq Mid .625
| Build | Parts | Total |
|---|---|---|
 | 17 | $1080.84 |
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