The Faxon Firearms Duty Series 9mm Barrel for Sig Sauer P365XL is a rugged, performance-focused drop-in upgrade built for shooters who demand duty-ready reliability and improved accuracy from their concealed carry pistol. Machined from 4150 CMV steel and finished in a tough black nitride, this Duty Series barrel (Part # 365A910NXNOQ-N, UPC 816341028487) is specifically designed to fit the Sig Sauer P365XL—giving you a direct OEM-length replacement that’s stronger, slicker, and more precise than a basic factory barrel.
If you want a non-threaded, carry-ready 9mm barrel for your P365XL that balances durability, accuracy, and value, the Faxon Duty Series 365A910NXNOQ-N is an excellent choice.
Duty-Grade Barrel for Sig Sauer P365XL
Faxon engineered this barrel as a true drop-in upgrade for the Sig Sauer P365XL platform:
Fits: Sig Sauer P365XL (9mm)
Caliber: 9mm Luger
Profile: OEM-length, non-threaded, drop-in replacement
No gunsmithing, no fitting—just field strip your P365XL, swap barrels, and you’re ready to go. It’s designed to maintain the pistol’s original footprint, so your existing holsters and carry gear remain fully compatible.
4150 CMV Steel – Built for Hard Use
The Faxon Duty Series line is about real-world durability, and this P365XL barrel is no exception. It’s machined from 4150 CMV (Chrome-Moly-Vanadium) steel, a material widely used in quality duty barrels due to its:
Excellent strength and toughness under heat and high round counts
Proven resistance to wear and erosion in defensive and training use
Suitability for high-volume shooters who train regularly
If your P365XL is a serious carry gun—not just a range toy—4150 CMV gives you the confidence that the barrel can handle the workload.
Black Nitride Finish – Corrosion Resistant and Slick
Faxon coats this barrel inside and out with a black nitride (QPQ) finish, adding:
Enhanced corrosion resistance – Great for IWB carry where sweat and moisture are constant threats
Increased surface hardness – Helps resist wear from slide contact and repeated firing
Improved lubricity – A slick surface that can reduce friction and make cleaning easier
The deep black nitride finish also gives your P365XL a clean, professional look that pairs well with both factory and custom slides.
Conventional Rifling & Optimized Twist for 9mm
Duty Series barrels are designed for real-world ammo versatility, typically featuring:
Conventional rifling – Compatible with a wide variety of bullet types, including properly loaded plated and lead bullets, unlike many polygonal barrels
An optimized twist rate (commonly 1:10 in Faxon 9mm barrels) to stabilize the most popular 9mm defensive and training loads
This makes the barrel a great match for everything from inexpensive practice ammo to premium defensive rounds.
Match-Style Features in a Duty Package
Although it’s built for duty and carry use, this barrel incorporates match-style design elements that help tighten groups and improve consistency:
Tighter tolerances than basic OEM barrels – Promotes a more consistent lockup between barrel and slide
Carefully machined chamber and crown – Support more repeatable accuracy shot to shot
Drop-in design – No fitting required, but still made to feel “snug” and precise in quality slides
The end result is a barrel that helps you get the most out of your P365XL’s inherent accuracy, especially when you pair it with good ammo and solid fundamentals.
Non-Threaded, EDC-Friendly Design
This model is a non-threaded P365XL barrel, which is perfect for:
Everyday concealed carry – No extra length sticking out of the slide, no thread protector to worry about
Holster compatibility – Works seamlessly with most standard P365XL holsters
Defensive use – Clean, snag-free muzzle profile
If you’re not planning to run a compensator or suppressor on your P365XL, a non-threaded Duty Series barrel is the simplest, most carry-friendly solution.
Ideal for Concealed Carry, Training, and Duty Use
The Faxon Duty Series 9mm P365XL barrel is a strong fit for:
Concealed carriers who want duty-grade reliability plus a small bump in precision
Defensive shooters and instructors who run a lot of rounds through micro-compacts
Duty or off-duty backup guns, where reliability and corrosion resistance are critical
Enthusiasts who want an upgrade from basic factory barrels without going overboard on price or aesthetics
This barrel is built to be used, not just admired.
Easy Upgrade with Big Benefits
Upgrading to a Faxon Duty Series barrel can offer several tangible advantages:
Potential accuracy improvement thanks to refined tolerances and rifling
Long-term durability under heavy training schedules
Better corrosion resistance for those who carry daily in hot or humid environments
More flexibility in ammo choice due to conventional rifling
It’s one of the most impactful single-part upgrades you can make on a compact carry pistol.
Key Specs – Faxon Duty Series 9mm P365XL Barrel
Manufacturer: Faxon Firearms
Series: Duty Series
Model: P365XL 9mm Barrel
Part Number: 365A910NXNOQ-N
UPC: 816341028487
Caliber: 9mm Luger
Fitment: Sig Sauer P365XL (non-threaded OEM-length replacement)
Material: 4150 CMV steel
Finish: Black nitride (inside and out)
Rifling: Conventional (optimized for common 9mm bullet weights)
Use Case: Concealed carry, defensive training, duty/off-duty backup, range use
These specs make it easy to confirm you’re picking the correct Faxon Duty Series barrel for your Sig P365XL.
Why Choose the Faxon Firearms Duty Series P365XL 9mm Barrel?
Choose this barrel if you:
Carry a Sig Sauer P365XL and want a duty-tough, corrosion-resistant barrel
Prefer 4150 CMV steel and black nitride for strength and longevity
Like the idea of conventional rifling that’s friendly to a wide range of 9mm loads
Want a non-threaded, holster-ready barrel that keeps your gun compact and snag-free
Value a drop-in upgrade that can enhance accuracy and reliability without complicated fitting
For concealed carriers, defensive shooters, and anyone who runs their P365XL hard, the Faxon Firearms Duty Series 9mm Barrel, Fits Sig Sauer P365XL, 4150 CMV (365A910NXNOQ-N / 816341028487) is a smart, practical upgrade that brings duty-grade performance to one of the most popular micro-compact pistols on the market.
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