TP-82
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The TP-82 is an out-of-service triple-barreled Soviet combination gun carried by cosmonauts on space missions. It was intended as a survival aid to be used after landings and before recovery in the Siberian wilderness. Wikipedia
Barrels: 3 (2 shotgun barrels and 1 rifle barrel)
Cartridge: 12.5×70mm shotgun (over) and 5.45×39mm rifle (under)
Effective firing range: 200 m (220 yd)
In service: 1986–2006
Used by: Cosmonauts