Faxon Firearms Duty Series Barrel Features The Faxon Firearms Duty Series barrel for the Sig Sauer P365 XL is machined from 4150 chrome moly vanadium steel a material chosen for its strength and ability to handle sustained use without losing accuracy. The black nitride finish applied over the steel adds a layer of corrosion resistance while also improving the barrel s natural lubricity which helps reduce friction during cycling. A 1:10 inch twist rate is matched to the 9mm Luger chambering for consistent stabilization of common bullet weights. Built as a drop in part the barrel installs without requiring any additional fitting on a stock P365 XL slide. Faxon markets this barrel as a top of the line option for shooters who want improved performance accuracy and durability over the factory barrel that ships with the pistol. The black nitride finish gives the barrel a clean uniform black appearance that matches most factory P365 XL finishes. Because the barrel is a direct fit for the P365 XL no slide milling or additional gunsmithing is required for installation. For P365 XL owners looking to upgrade reliability and finish quality without changing their carry setup this Duty Series barrel is a straightforward option. Faxon Firearms Duty Series Barrel Specifications Manufacturer: Faxon Firearms Model: Duty Series Barrel Caliber: 9mm Compatible Hosts: Sig Sauer P365 XL Barrel Finish: Black Nitride Barrel Material: Chrome Moly Vanadium Barrel Type: Drop In Twist Rate: 1:10 Sights: None Barrel Length: 3.1 Available At: GrabAGun