Would that make it mightier than a sword?
Hardly.
My father had one of these .22 pen guns. We experimented with it a couple times.
The cruddy little thing was only chambered to hold .22 Ball caps which didn't have the velocity to penetrate a fart.
They couldn't chamber a .22 short round.
They were good as starter pistols, I guess, shooting blanks. Otherwise, what were they good for?
Absolutely nothing, uh huh...