Zapper
From The Stargate Omnipedia
Device utilized by soldiers of the world designated P4M-328. The unit can be concealed within the hand and, when used on a subject, will stun a person into unconsciousness.
KEY EPISODE
Bad Guys - Lourdes Malay takes an opportunity to render medical aid to a hostage into his own hands, dispatching troops with zappers into the building instead, stunning Daniel Jackson.