Anybody know anything about Magnum Research BFR (BIG FRAME REVOLER) .500 S&W? I have a possible trade that may happen but I have no clue what these guns reputation is. I went on gunbroker and found a round about selling price but doesn't tell me if these guns are a P.O.S. or if they are the best thing since sliced bread. Just looking for some input if any has any?