Originally Posted by mcb
Rugers single actions made before 1973 (Old Models) were not safe to carry with the hammer on the chamber. New Model Ruger single actions use a transfer bar system to make them safe.
Ruger will convert Old Models free of charge. This may impact collector value and IMO the NM and conerted OMs do not shoot as well
To add: I have an early old model single six. Standard practice before the transfer bar was a 5 round load, hammer on empty cylinder. Once my kids got involved in shooting I opted to send it in to Ruger for plain old safety reasons. It was a win-win for me, true to their word I got my pistol back with with the old parts, I could change her back at anytime I please. I will say the trigger isn't as crisp and is heavier than before, but given its role as fun plinker and teaching platform that I've chose to use it for over the years, safety trumped trigger feel for piece of mind with the youngsters...