Zaffiri Precision Upper Parts Kit Features The Zaffiri Precision Upper Parts Kit is built specifically around Glock 19 Gen5 geometry including a firing pin firing pin spring firing pin spacer sleeve and firing pin safety spring sized to that generation s slide dimensions. The firing pin safety itself carries a nitride finish which adds wear resistance and corrosion protection to a part that cycles with every trigger pull. An extractor extractor depressor plunger and matching plunger spring round out the fire control components needed to complete a custom slide build from scratch. Because the parts are manufactured to the highest tolerances against original factory specifications fit and function closely mirror a factory Glock slide. The kit also includes a spring loaded bearing firing pin channel liner slide cover plate and a complete recoil spring assembly with guide rod giving builders everything needed beyond the slide and barrel itself. Two spring cups are included as well rounding out small components that are easy to lose if sourced piecemeal from multiple suppliers. All parts are manufactured by a US manufacturer which matters to builders who want confidence in material quality and consistency. Being Gen5 specific this kit is not compatible with other Glock generations so builders working on a Gen5 platform get a kit tailored exactly to their project available for sale at GrabAGun. Zaffiri Precision Upper Parts Kit Specifications Manufacturer: Zaffiri Precision Model: Upper Parts Kit Compatible Hosts: Glock 19 Gen5 Includes: Firing Pin Firing Pin Spring Spacer Sleeve Spring Cups Firing Pin Safety Safety Spring Extractor Depressor Plunger and Spring Spring Loaded Bearing Firing Pin Channel Liner Extractor Slide Cover Plate Recoil Spring Assembly Available At: GrabAGun