Faxon's Match Series pistol barrels for Sig P320 are machined in-house from stress-relieved 416-R stainless steel. These barrels are then given a black nitride or PVD coating to increase lubricity, barrel life, and resistance to surface wear. All barrels are conventionally rifled to allow a wider range of ammunition to be used, including cast lead. The barrels drop into factory-spec slides with no gunsmithing required. Better-that-factory tolerances ensure a consistent, tighter lockup than OEM. Product Specifications Model: Match Series Caliber: 9mm Luger Firearm Fit: Sig Sauer P320 Color: Black Nitride Material: 416R Stainless Steel Barrel Finish: Salt Bath Nitride Twist: 1:10" Style: Drop-In Thread Pattern: 1 / 2"x28 Barrel Description: Straight Fluted