I was a S&W revolver armorer for my department back in the Dark Ages (which seemed much brighter than today), and I have installed a fair number of hammers in K-Frames over the years. The vast majority of the time there was no fitting required other than usually swapping the sear from the old hammer to the new one. We never dealt with the S&W DAO revolvers, so I am not sure, but I assume the trigger in your revolver is a standard unit.
Of course, your mileage may vary, but there is a really good chance the new hammer will work. If it comes with a sear, give it a try, and if it doesn't work, swap sears with the old hammer and see if that works. If it doesn't, a decent gunsmith can fit it for you for a moderate cost.
Last edited by wildhobbybobby; 11/01/22.
