This is for cleaning.
Pull the cotter pin from the left side of the bolt carrier. The firing pin should now slide out freely.
Push the bolt in to the bolt carrier, remove the camming arm.
Now the bolt will come out of the front of the bolt carrier.
Knock out the extractor retention pin and the extractor will come free.
This is as deep as you need to disassemble the bolt for cleaning unless you have an ejector failure, but that is rare if you keep it lubed.
Jimro