Richard, for me it's not a question of the hammers rebounding but the firing pins float so freely that if the receiver is pointing down, such as carrying muzzle down in a cart, when you open the gun to load a shell, then try to close the gun, the firing pin/pins may protrude and not allow the gun to be closed until the pin/pins are pushed back by hand. The tip of the firing pin catches the base of the shell.
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