Customize your pistol with the CMC Triggers 75521 GLOCK 17 Gen 3-4 Fluted Threaded Replacement Barrel. The 416R stainless-steel construction resists corrosion and is durable, and the double-honed design creates a smooth bore. CMC Triggers 75521 GLOCK 17 Gen 3-4 Fluted Threaded Replacement Barrel Gray - Outdoor Supplies And Accessories at Academy Sports