Install the Strike Industries GLOCK Gen4 Slide Compensator onto the end of your barrel to eliminate the need for threading. It fits onto 4th generation GLOCK pistols and is made from CNC-machined aluminum with a no-snag profile. Since it mounts on the slide, no permanent modification is required. Compatible with open-bottom holsters. StrikeIndustries Strike Industries GLOCK Gen4 Slide Compensator - Gun Cases And Racks at Academy Sports