Upper Parts Kit for Glock 17/17L/34 Gen 5 A complete upper parts kit engineered to finish custom Gen 5 slides with factory-fit reliability. All components are manufactured in the United States to tight tolerances and original specification dimensions to ensure consistent fit and function in Glock 17 17L and 34 Gen 5 slides. This Gen 5 specific kit is not compatible with earlier Glock generations. The kit includes a firing pin spring, firing pin spacer sleeve, two spring cups, nitride firing pin safety, firing pin safety spring, nitride extractor depressor plunger, extractor depressor plunger spring, spring loaded bearing, firing pin channel liner, extractor, slide cover plate, and an upgraded stainless steel recoil spring assembly with OEM spring weight. Each part is selected to support reliable ignition, positive extractor engagement and durable slide operation under high round-count use. Ideal for gunsmiths and builders completing a custom slide, this kit consolidates all Gen 5 upper components into a single, ready-to-install package that preserves factory geometry and long-term service life.