Introducing the Integrated Blowhole System (IBS). We took our 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. 100% American made and manufactured at the facility in Largo FL. These are among the best aftermarket slides available for Glock. This slide is pre-cut and pre-coated and no changes can be made.