As far as bullet impacts go, I remember doing a question in physics about the forces involved on impact; say the person is being shot by someone holding a Glock. The person being shot is holding a sturdy plate the size of his chest (there were specifics like weight, etc, but I don't remember, it was over a year ago now.
It ended up that at point blank range, the total weight felt by the person holding the plate on impact was about 5 kg.
So really, the forces aren't much.
Now if you're talking about a gun like a desert eagle, then you will probably have some kind of impact; a desert eagle has the power to shatter the bones in your arm if not held properly, (through recoil). Now assuming point blank range for that, this means the person being shot will likely at least stagger.
The other thing we have to take into account is that for the most part, the shooter is braced for the hit, whereas the shootee is mostly not. Say you're running away from the gun when its fired, chances are shock, impact, momentum and such will cause you to fall forward. Running towards it, you might fall from shock, but it probably wouldn't stop you from moving forward.
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