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A stun pistol is a non-lethal hand-held directed energy weapon. As the name suggests, it only fires a stun beam. However if a stun pistol was fired at point-blank range at the head of a target, it could cause some brain damage. If fired at arms or legs, the feeling would return in about four hours.
Cervantes Quinn carried a stun pistol and used it on several occasions. (VAN - Declassified novella: The Stars Look Down)