Zaffiri Precision Complete Upper for Glock 19 Gen 3 includes a slide, barrel, internal parts, and sights. Single billet 17-4 stainless steel slides are made with tight tolerances increasing accuracy and performance. These are among the best aftermarket slides available for Glock. Optics Cut: Trijicon RMR / SRO and Holosun 407c / 507C / 508T 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). Includes black anodized cover plate. Complete Upper for Glock 19 Gen 3 comes with proper mounting screws specific to the optic. You must use the screws they provided. Blue Loctite recommended for proper sight retention. Do not exceed optic manufacturers screw torque specifications. Specifications for Zaffiri Precision Glock 19 Gen 3 ZPS.2 RMR Cut Complete Upper: Manufacturer: Zaffiri Precision Gun Make: Glock Gun Model: Glock 19 Gen 3 Model Generation: 3 Optic Cut: RMR Cut Finish: Cerakote Fabric/Material: 17-4 Stainless Steel Magazine Included: No Package Contents: Zaffiri Precision Glock 19 Gen 3 ZPS.2 RMR Cut Complete Upper ZP ZPS.2 G19 Gen 3 Slide - Sniper Grey ZP ZP.19BBN G19 Flush and Crown Barrel - Black Nitride HD Fiber Sights G19 Gen 3 Upper Parts Kit with polymer Recoil Spring Assembly