Zaffiri Precision UPK, Upper Parts Kit, For Glock 43/43X/48, Includes Firing Pin and Spring, Spring Cups, Safety Plunger and Spring, Extractor w/LCI, Extractor Deprssor Plunger Assembly, Slide Recoil Cover Plate, Recoil Spring Assembly (Guide Rod) G43.UPK Upper Parts Kit (UPK) for Glock 43 / 43X / 48. These are great for completing your custom slide. All parts are from US manufacturer. All Parts are made to the highest tolerance to the original specification. These parts are specific and not compatible with any other Gens or models.