I've shot semi-autos my whole life, but never revolvers. I wanted something accessible when I'm out walking & dressed like an Eskimo here in the north, something I can CC in a coat pocket holster; I don't like really small pistols like the LCP for pocket carry, a matter of personal preference. So today I bought a S&W 642 because it seems perfect for what I want. The hammer's shrouded, and thus I can't see anything...which leads to my question: What kind of built-in protection is there against an AD if the firearm is dropped? Someone told me there's a hammer block, but didn't seem to know how it worked (which led me to think perhaps he didn't really know a lot about the revolver in question!). My guess is that old hands with wheel guns know the proper answer.