a mossberg chuckster...you've got a dandy lil gun there,they are accurate varmiters up to100 yards or so.
anyhow,as far as removing the bolt,its easy once you get it .If memory is correctyou pull the trigger(make sure its empty),pull the bolt back while pulling the trigger and it should slide on out.theres a flat piece that the bolt sets inthat acts like a safty..its where the handle hits when its down,I think you need to depress it also or it wont release.Im not sure but I think its how I took mine out,its been a very long time.
perhaps someone else will chime in