Zaffiri Precision UPK, Upper Parts Kit, Does not Include Guide Rod, For Glock 17/19/26/34 Gen 1-4, Includes Firing Pin and Spring, Firing Pin Spacer Sleeve, Firing Pin Channel Liner, Spring Cups, Safety Plunger and Spring, Extractor, Extractor Depressor Plunger Assembly, Slide Recoil Cover Plate UPK These are for Glock 19 / 17 / 17L / 26 and 34 - Gen 1-4. VERY IMPORTANT - GUIDE ROD (Recoil Spring Assembly) IS NOT INCLUDED! These are great for completing your custom slide. All parts are from US manufacturers. All Parts are made to the highest tolerance to the original specification.