Actually, the hammer block doesn't move in front of the pin, but the hammer. It blocks the hammer from falling all the way. This is the old style Smith and Wesson action. Taurus moved away from that, used to use the hammer block action, then revised to the Ruger style transfer bar mechanism which I much prefer. As far as I know or at least in the last 25 years or so, Taurus has used a floating firing pin rather than a hammer mounted one, though. I rather prefer this, too. I've had an issue with one M971 Rossi snapping a firing pin. Got it fixed, needed proper fitting. I've heard of the firing pin spring in a floating firing pin breaking, but I've never experienced it.There are differences such as Smooth 1 has noted. The hammer mounted firing pin is one of those differences from Taurus. According to the web site for Rossi, there is a bar of metal that does intersperse itself between the firing pin and the cartridge while the revolver action is at rest.