Release your handgun's gas and enjoy flatter, faster, follow-up shots with the Zaffiri Precision GLOCK 19 Gen 3 Integrated Blowhole System Barrel. The built-in blowhole system a single large port releases more gas up and out quickly, reducing carbon buildup for extra shooting control. Note: this barrel only works and fits with the Zaffiri Precision IBS Ported G19 Gen 3 Slide. It is compatible for GLOCK 19 Gen 1 through 4 (Gen 5 is too short). This high-quality, drop-in, back-bored barrel from Zaffiri Precision comes equipped with a 1-in-10" rate of twist for downrange accuracy. The chamber and bore perform well with lead, plated, and jacketed bullets. This finished and ready-to-use ported barrel is made of stress relieved and heat-treated 416R stainless steel. Flush and crown length. Target crown and oversized lock up area. Displays a large ZP logo on portside of lockup. Built-in blowhole system allows for flatter, faster, follow-up shots Only fits with the Zaffiri Precision IBS Ported G19 Gen 3 Slide Compatible with GLOCK 19 Gen 1 through 4 Drop-in, high-quality, back-bored barrel 1-in-10" rate of twist adds downrange accuracy Performs well with lead, plated, and jacketed bullets Heat-treated 416R stainless steel