Introducing the Integrated Blowhole System (IBS) for Glock 19 Gen 3. We took time tested ZPS.1 slide and blended it with the Blowhole Compensator allowing you to manage that unruly gas. Gain the flat shooting features of the compensated setup without the threaded barrel. The single billet 17-4 stainless steel slides are made with tight tolerances that allow an increase in accuracy and performance. American made and manufactured at the facility in Florida USA. These are among the best aftermarket slides available for Glock. This slide is cut for an RMR footprint and fits optics with an RMR footprint.