I have a model 64-5 in 38 special. It's a factory dao. I'm wanting to convert it to sa/da. I have read that all you have to do is replace the hammer. I've also read you have to replace the trigger as well. Anybody know for sure? Before anybody asks, it is a factory dao, it doesn't just have a bobbed hammer. As I understand it is a law enforcement turn in. I love the gun, just don't like that double action. Any insight is greatly appreciated.