Included in this Maintenance kit are 2 Firing Pin Stop Pins for current and previous bolt design generations. If your bolt shows an engraved “ Z ” on the lower left-hand side, you will need to use the longer, 1/2” inch Firing Pin Stop Pin. If your bolt does not show an engraved “ Z “ you will need to use the 3/8” inch Firing Pin Stop Pin. 

Kit includes:

-2 Recoil Springs

-1 Extractor Spring

-1 Firing Pin Spring

-1 Firing Pin Stop Pin 1/2" [FOR USE WITH "Z" BOLT]

-1 Firing Pin Stop Pin 3/8"

-1 Buffer