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 Zaffiri Precision's facility. These are among the best aftermarket slides available for Glock. Complete Upper for Glock 17 Gen 3 includes: ZP ZPS.3 G17 Gen 3 Slide ZP ZP.17BTBN G17 Threaded Barrel - Black Nitride HD Fiber Sights G17 Gen 3 Upper Parts Kit with Recoil Spring Assembly Optics Cut (Red Dot Footprint): Trijicon RMR / SRO, Holosun 407c / 507c, and other popular "R Mfg: Zaffiri