This Zaffiri Precision Complete Upper takes the 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 a 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. These are among the best aftermarket slides available for Glock. This slide is pre-cut and pre-coated.Trijicon RMR / SRO, Holosun 407c / 507c, and other popular " RMR footprint" optics - mounting position is in front of the factory location of the rear sight (dovetail remains behind the optic cut). Slide comes with proper mounting screws and a black anodized cover plate specific to the optic cut. You must use the screws provided. Blue Loctite is recommended for proper sight retention. Do not exceed optic manufacturer's screw torque specifications. DISCLAIMER: This product is not manufactured, authorized, endorsed, or wa...