Did anyone else get this gun yet? When doing the mission "Talent Pool" one of the recruits talks about his life then you offer him a job and he gives you the "Mysterious Magnum" which is the same magnum from the Mysterious Stranger in fallout 3. Has a nice guitar ring to it too every time you take it out and put it up.
You go to the Tops and go to the Aces section and Tommy or what ever will give you the quest to start it. You get a whole lot of dough for not really even doing anything.