The Soviet NRS-2 ballistic (as in gun) knife
Back in the 1500s when pistols were pretty hit and miss (puns, anyone!) many designed for hunting came complete with a wicked blade that was affixed to the end to allow a hunter to finish off his harvest– or defend himself from advancing wounded boars, wolves or bears.
These knife-guns fell out of favor over time but come back up in other forms in recent generations.
“This is a special Soviet knife designed in the 1970s at the order of the Ministry of Defence and KGB of the USSR. An ordinary scout’s knife had to turn into a combined multifunctional weapon. They made a knife with a firing device adapted for a special 7,62 mm cartridge. “
Reminds me of the U.S. Made GRAD and the Italian made Arsenal .22LR revolver knives that have been imported for years as AOWs. They are little 5-6 shot revolvers that double as a M7 style (AR-15/M4/M16) bayonet.
I covered them and other knife-guns in more detail over at Guns.com a few years back.