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 IncludesSpring Loaded BearingSlide Cover PlateFiring Pin Safety with SpringFiring Pin AssemblyExtractor Depressor PlungerGuide Rod and Recoil Spring AssemblyExtractorExtractor Depress Plunger SpringFiring Pin Channel Liner