I got the Fastfire mount for a Ruger Blackhawk. Fit is great. I bought a Vortex Viper to get a low profile system. FWIW, It is necessary to electrically isolate the Viper from the Fastfire mount with a small piece of electrical tape since the Viper has an exposed battery. A great setup.
Wow, I looked back and it only took me a year to get my FF3 mounted, test fired at the range and pics posted.
Guys, this is the lowest mount I have seen for a red dot sight on a revolver. I plan to buy more of these for other revolvers and possibly my T/C Contender.... and the 10/22, and.... LOL.