I'd like to ask regarding the feasibility of buying one (or two) replacing the spurless hammer (assuming that will make it SA-capable) and having the 4-inch barrel replaced with a 3-incher, in order to get the gun I really want. So, will replacing the hammer make this a DA/SA revolver or is there something mechanically different inside that make this cost prohibitive? What about the barrel replacement...is there a source for available barrels? Would S&W do it or should I look for a local gunsmith? Can you offer any ideas as to approximate cost for the above-detailed changes? Thank you, gentlemen. D.