Sounds like a model 60 or 600.... if you want to disassemble the bolt,may I suggest that you take it or send it to a gunsmith for disassembly. The bolt is under pressure and needs a special tool to take it apart. I have seen and heard about people getting hurt and bolts being damaged by someone that tried to do the job uninitiated.
If you just want the bolt out as a whole...then the same stud nut that holds the stock in place needs to be let off and the bolt will come clear of the action when the trigger is held back. Take note of how it comes apart so you can reassemble it again.