You can find the Faxon Match Series Barrel for G19 Gen1-5 Flame Fluting Nitride here.

Faxon's Match Series Pistol Barrels for Glock 19 are machined 100% in-house from stress-relieved 416-R steel. These barrels feature Flame Fluting and are then given a black Nitride coating to increase lubricity, barrel life, and resistance to surface wear. All barrels are conventionally rifled to allow a wider range of ammunition, 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 barrels.

Specifications:

• Handgun Type: G19 (Compatible with Gen 1-5, including 19x and G45)
• Barrel Caliber: 9mm
• Barrel Profile: Drop In
• Barrel Material: 416-R
• Barrel Twist: 1:10
• Muzzle Thread: None
• Crown: 11-degree Target Crown
• Rifling Method: Button Rifled, Fully Stress Relieved
• Rifling Type: Conventional
• Inside Finish: Salt Bath Nitrid