Zaffiri Precision ZPS.3, Optics Ready Complete Slide, RMR Footprint, Lightening Cuts, Threaded TiN Gold Barrel, HD Fiber Sights, Cerakote Finish, Armor Black, For Glock 17 Gen 3, Gen 3 Upper Parts Kit w/Polymer Recoil Spring Assembly, Includes Black Anodized Optics Plate Cover and Screws ZPS.3.17.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.