tech some kind of non-lethal weaponry about the same size as a 'gun'.
A Stunner is a general term for a science fiction weapon that is designed to temporarily impair the motor and/or cognitive functions of a living being, usually by rendering it unconscious, but otherwise unharmed.
Stunners (aka "knocker, knock bolt, bolt gun) is the device used to render red meat animals unconscious prior to further slaughter procedures such as sticking(bleed out), skinning, removal of hooves.