I just picked up a smith 3953 and was interested to see what internals I would need to convert it to da/sa. I know I would need the 3913 hammer drop/safety, but other than that I am clueless. Any info would be greatly appreciated. This gun will not be used as a CCW, it will be for my wife and kept in a clock safe at home. We went to the range today and she shot it and liked it but we also rented a 3913 and she liked the sa trigger much better.