Faxon Duty Series Barrel for SIG P365 | Black

Faxon Duty Series Barrel for SIG P365 | Black

The Faxon Duty Series Barrel for SIG P365 is a compact, non-threaded replacement barrel built around durability, straightforward fitment, and hard-use reliability. Machined from stress-relieved 4150 Chrome Moly Vanadium steel, this 9mm barrel uses a full Salt Bath Nitride treatment inside and out while maintaining the factory-length profile of the standard P365 platform.

Unlike Faxon’s threaded and fluted P365 options, this Duty Series configuration is focused on a simple drop-in upgrade with no extended muzzle or decorative exterior machining. Its approximately 3.09-inch length keeps the barrel contained within a standard P365 slide, making it particularly well suited to compact carry, defensive, training, and general-purpose builds.

Faxon uses conventional button rifling with a 1:10 twist rate, allowing broad ammunition compatibility that includes both jacketed and cast-lead projectiles. The 9mm chamber is manufactured to SAAMI specifications, while tighter-than-factory tolerances are intended to provide consistent fit and lockup in factory-spec P365 slides.

An 11-degree target crown finishes the muzzle, and the Black Nitride treatment provides a hard, corrosion-resistant exterior while also treating the bore and internal surfaces. The result is a practical P365 replacement barrel that emphasizes durability and compact dimensions rather than threaded-muzzle capability or Match Series fluting.

Key Features

• Duty Series barrel for SIG P365
• Standard non-threaded configuration
• Approximately 3.09-inch overall length
• Chambered in 9mm
• Stress-relieved 4150 CMV steel construction
• Black Salt Bath Nitride finish inside and out
• Conventional button rifling
• 1:10 twist rate
• 11-degree target crown
• SAAMI-spec chamber
• Tighter-than-factory fitment and lockup
• Compatible with cast-lead and jacketed projectiles
• Drop-in fit for factory-spec SIG P365 slides
• Made in the USA
• Backed by Faxon’s Lifetime Guarantee

Compact P365 Replacement Barrel

At approximately 3.09 inches long, this Duty Series barrel maintains the compact standard-length P365 configuration. With no threaded extension beyond the slide, it is a strong choice for shooters who want a durable aftermarket barrel while preserving the original proportions of the pistol.

4150 CMV Duty Series Construction

Faxon builds the Duty Series around stress-relieved 4150 CMV steel rather than the 416-R stainless construction used in its Match Series P365 barrels. A complete Salt Bath Nitride treatment provides wear resistance, corrosion protection, and lubricity across both the exterior and internal barrel surfaces.

Conventional 1:10 Rifling

The conventional button-rifled bore uses a 1:10 twist rate and supports a broad selection of 9mm projectile types, including cast-lead ammunition. An 11-degree target crown completes the non-threaded muzzle.

Compatibility

• SIG P365
• Factory-spec standard-length P365 slide assemblies
• Compatible aftermarket slides designed around the standard P365 barrel system