Faxon Firearms Match Series, 1:10 Twist Barrel, 4.5, 9MM, For Glock 19 Gen 2-5/19X/45, Threaded 1/2x28, Nitride Finish, Black GB910N19LGQ-T Faxon's Match Series Pistol Barrels for G19 / Glock 19 are machined 100 percent 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.