How hard would it be to make a dual-mode handgun or shotgun that, depending on how it's fired, shoots either lethal or rubber / electric slugs?

Not as in it's merely stocked with successive rounds, but that it actually has two separate clips and two separate firing methods that are distinct enough that someone who's under heavy adrenaline can shoot the correct one with absolute certainty and reflex action, somehow prevents being loaded the wrong way around, etc.
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