Zaffiri Precision ZPS.2, Optics Ready Complete Slide, RMR Footprint, G17 Gen 3 Barrel, Black Nitride Finish, HD Fiber Sights, Cerakote Finish, Armor Black, For Glock 17 Gen 1-3, Includes Black Anodized Optics Plate Cover and Screws ZPS.2.17.BLK.CU Zaffiri Precision Complete Upper for Glock 17 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. 100% American made and manufactured in-house at their facility. These are among the best aftermarket slides available for Glock.