Hi, Stargazer,
FWIW, I spent a lot of time (which could probably have been better spent) trying to work over Ruger DA revolvers to have as good a DA trigger as the S&W's. I came pretty close, but never got there, nor do I think it is possible short of actually making a new hammer and trigger of a different design. The genius of the S&W mechanism makes it what it is, and the camming system simply has not, I believe, been duplicated in any other make. (Ruger has now almost matched the S&W system, but in the LCR, not in their service type revolvers.)
Jim
FWIW, I spent a lot of time (which could probably have been better spent) trying to work over Ruger DA revolvers to have as good a DA trigger as the S&W's. I came pretty close, but never got there, nor do I think it is possible short of actually making a new hammer and trigger of a different design. The genius of the S&W mechanism makes it what it is, and the camming system simply has not, I believe, been duplicated in any other make. (Ruger has now almost matched the S&W system, but in the LCR, not in their service type revolvers.)
Jim