Re: ok, here she is...my Ruger 357
New model=safer model. Some years back, Ruger slightly changed the design to incorporate a safety transfer bar. Whereas before you could not leave the hammer down on a loaded chamber, now the trigger has to be fully depressed for the hammer to contact the firing pin. There were also some small differences in the number of screws in the side plates of the gun.<br /><br />Ruger will retrofit all 'old' (original) models, with the safety transfer bar, free of charge. It is not necessary to machine modify the gun to do so. They will return all original parts with your 'safetyized' gun.