Re the S&W hammer and sear relationship. During a "double-action" (trigger pull) the sear NEVER contacts the hammer's sear notch, only the "fly" on the hammer is lifted by the trigger lever caming surface. The sear notch is completely bypassed. Anyone who shoots NRA bullseye with a revolver does it single action, though the Canadian champion has been known to fire the remaining 4 in a rapidfire string as double-action.
And for those contending that it is damaging to a 1911 to drop the slide, it is done by most target shooters on a regular basis - come on guys the metal is hardened! No damage results unless you do it a million times or so!
J.