This SIG Sauer factory barrel is a 3.7-inch, threaded 9mm barrel built for the P365 and P365-X slide assemblies from Sig Sauer (brand part no. 8902059). Threaded 1/2-28 RH with a thread protector cap included, it opens up compensator and suppressor compatibility on a pistol that didn’t ship threaded from the factory. It features SIG’s loaded chamber indicator witness hole and is heat-treated for toughness the same way as SIG’s other factory replacement barrels. Note that it’s not compatible with the P365-XL, P365-XMACRO, or P365-FUSE slide assemblies.

Key Specifications

• Chambered in 9mm, barreled at 3.7 inches.
• Fits P365 and P365-X slide assemblies.
• Not compatible with the P365-XL, P365-XMACRO, or P365-FUSE slide assemblies.
• Threaded at 1/2-28 RH.
• Includes a thread protector cap for when no compensator or suppressor is attached.
• Features a loaded chamber indicator (LCI) witness hole.
• Heat-treated for toughness and durability, per SIG’s factory process.

Frequently Asked Questions

Does this fit the P365-XL? No, it’s compatible with the P365 and P365-X slide assemblies only, not the P365-XL, P365-XMACRO, or P365-FUSE.

Is a thread protector included? Yes, a thread protector cap ships with the barrel for when no muzzle device is attached.

What thread pattern does it use? 1/2-28 RH.

Buy the SIG Sauer P365 Threaded Barrel

Add threaded muzzle compatibility to your P365 or P365-X with this genuine SIG factory barrel. It ships fast from our Lubbock, Texas gun shop, and our handgun barrels selection has more handgun barrels for your build.