The Glock Slide Parts Kit features factory original parts from Glock. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation. Some parts may need to be installed by a qualified gunsmith. Kit IncludesFiring Pin Spring CupsSpring Loaded BearingSlide Cover PlateFiring Pin Safety with SpringFiring Pin SpringExtractor Depressor PlungerGuide Rod and Recoil Spring AssemblyExtractor with Loaded Chamber IndicatorExtractor Depress Plunger SpringFiring Pin Spacer SleeveFiring Pin Channel LinerFiring Pin