Basically, what is involved in changing a m64 DAO into a SA/DA revolver? I have a chance to purchase a DAO and would like to change it to a regular type of revolver. I have not personally seen the revolver yet, but it does have a 4 in. barrel. It may have been an ex-police revolver, I don't know yet. And, what is the value of one of these, assuming very good condition? I have to travel to see it and am trying to cover my bases, so to speak, before the trip.