Introducing the Integrated Blowhole System (IBS). 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. Optic Cut – Shield RMSc Sig Romeo Zero and Holosun 407k / 507k