ZEV Technologies Glock 19 Gen1-5 9mm Luger PRO Match Grade Threaded Pistol Barrel 1-10 Twist 1/2x28 Bronze PVD Black. Every barrel is double honed (rough and finish) until a minimum surface finish of 16 RA is reached. During this process the barrels are held to a final dimension of +/- 0.003'' for consistency and accuracy. Specifications for ZEV Technologies Glock 19 9mm Luger PRO Match Grade Threaded Pistol Barrel: Manufacturer: ZEV Technologies Color: Bronze Finish: PVD Fabric/Material: 416R Stainless Steel Threads per Inch: 1/2x28 Barrel Twist Rate: 1-10 Caliber: 9mm Luger Gun Make: Glock Gun Model: Glock 19 Gen 5 Glock 19 Gen 1 Glock 19 Gen 2 Glock 19 Gen 4 Glock 19 Gen 3 Condition: New Features of ZEV Technologies Glock 19 9mm Luger PRO Match Grade Threaded Pistol Barrel Match Grade drop in barrel 1-14'' twist rate SAAMI spec. Match chambers Package Contents: ZEV Technologies Glock 19 9mm Luger PRO Match Grade Threaded Pistol Barrel What firearm models does the manufacturer say ZEV Technologies Glock 19 9mm Luger PRO Match Grade Threaded Pistol Barrel is compatible with? The manufacturer suggests that ZEV Technologies Glock 19 9mm Luger PRO Match Grade Threaded Pistol Barrel is compatible with Glock 19 Gen 3 Glock 19 Gen 4 Glock 19 Gen 2 Glock 19 Gen 1 Glock 19 Gen 5ZEV Technologies BBL-19-PRO-TH-B: Glock 19 Gen1-5 9mm Luger PRO Match Grade Threaded Pistol Barrel 1-10 Twist 1/2x28 Bronze PVD Black