Just revisiting this sticky, it bears mentioning that more current S&W production is quite drop safe. I've personally examined two Smith J-frames which had been dropped on the hammer spur hard enough to break it off. Neither fired. I removed the hammer on at least one of them, and ground off/refinished the remainder. IIRC, I ground off the single action sear as well.S&W didn't drop proof the pistols till 1945 . Till then was a chance. I learned this as I bought a old S&W . Its serial number was strange . When I checked with S&W they told me that showed first year of hammer block . Was made 1945 . My oldest S&W is 1880 I belive it will fire if hammer hit .