The Zaf Upper Parts Kit (UPK) is specifically designed for Glock 17 Gen 3 pistols providing all necessary components for completing your custom slide build with US-manufactured quality.Zaf Upper Parts Kit for Glock 17 Gen 3Complete UPK set with all required componentsUS manufacturer with highest tolerance specificationsGen 3 specific compatibility - not compatible with other generationsEngineered to original manufacturer specificationsPerfect for gunsmiths enthusiasts and builders looking to complete custom Glock 17 Gen 3 slide projects with reliable precision-manufactured components.