Complete your custom slide with the Zaffiri Precision GLOCK 19 Gen 5 Upper Parts Kit. It includes firing pin spring, firing pin spacer sleeve, 2 spring cups, firing pin safety, firing pin safety spring, extractor depressor plunger, extractor depressor plunger spring, spring-loaded bearing, firing pin channel liner, extractor, slide cover plate, and recoil spring assembly (guide rod). All parts are made to the highest tolerance to the original specification to ensure long-lasting, reliable performance. Note: This kit is intended to be installed by a competent gunsmith.Kit includes: Firing pin spring Firing pin spacer sleeve 2 spring cups Firing pin safety Firing pin safety spring Extractor depressor plunger Extractor depressor plunger spring Spring-loaded bearing Firing pin channel liner Extractor Aluminum slide cover plate Recoil spring assembly (guide rod)