New ZAF19UPK Zaffiri Precision, UPK, Upper Parts Kit, For Glock 19 Gen 1-3, 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, Guide Rod Upper Parts Kit (UPK) for Glock 17 / G17L / G34 - Gen 1 - 3. These are great for completing your custom slide. All Parts are made to the highest tolerance to the original specification. Features : Firing Pin Spring Firing Pin Spacer Sleeve Spring Cups (2-Pieces) Firing Pin Safety Firing Pin Safety Spring Extractor Depressor Plunger Extractor Depressor Plunger Spring Spring Loaded Bearing Firing Pin Channel Liner Zaffiri Precision, UPK, Upper Parts Kit, For Glock 19 G19 Gen 1-3 19.