I have never dropped a gun on its muzzle in my entire life...no one I know has. In theory, a 1911 could fire if dropped, but then cows could poop on people if they could fly. The danger of a Series 70 style 1911 is mostly a matter of "what if", and no data shows shootings/injuries resulting from accidental droppings.A well-respected firearms author named Walt Kuleck and a gunsmith friend of his named Drake Oldham conducted a series of drop tests with a complete 1911 pistol (not just a slide and barrel) and they found that they could get drop fires from heights as low as three feet. The results of their tests were enough to convince a number of 1911 people (myself included) to shift to using only Series 80 pistols for carry.
Walt wrote up his tests on the M1911.org forum a couple or three years ago. The testing was extensive and conclusive.