Faxon's Match Series Pistol Barrels for G17 / Glock(R) 17 are machined 100% 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-than-factory tolerances ensure a consistent, tighter lockup than OEM.Why Faxon Pistol Barrels? 4150 or 416-R Stainless - Only the best steels for durability, longevity, and accuracy. 9mm SAAMI Chambers - Superior accuracy with complete SAAMI compatibility & boring reliability. Tighter Tolerances - Drop-in, yet better fitment and lock-up. Conventional Rifling - Fully compatible with cast bullets 11 Degree Target CrownSpecifications: Handgun Type: G17 (Full Size Glock) Barrel Caliber: 9mm Barrel Profile: Drop In (Compatible with Gen 1-4) Barrel Material: 4150 Steel Barrel Twist: 1:10 Muzzle Thread: 1/2x28 TPI Crown: 11-degree Target Crown Rifling Method: Button Rifled, Fully Stress Relieved Rifling Type: Conventional Inside Finish: Salt Bath Nitride Outside Finish: Salt Bath Nitride*Will not ship to CAPlease note: There is a known issue of compatibility with Faxon Glock pattern barrels and some patterns of Zaffiri Precision slides. This seems to be an issue with ZPS.3v2 and ZPS.6 pattern slides due to the size and placement of the top window on the slide.