The Zaf Upper Parts Kit (UPK) is specifically designed for Glock 19 Gen 5 pistols providing all necessary components to complete your custom slide build with precision and reliability.Zaf Upper Parts Kit for Glock 19 Gen 5US manufactured components for quality assuranceManufactured to highest tolerance specificationsGen 5 specific design - not compatible with other generationsComplete kit for custom slide completionPerfect for gunsmiths custom builders and enthusiasts looking to complete their Glock 19 Gen 5 slide project with precision-manufactured components that meet original specifications.