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The Apache revolver became a Swiss Army knife of sorts for thieves of the French underworld in the 1900s. It's parts include a knife, pistol and set of brass knuckles that all easily fold together. Because the pistol has no barrel it's effective range is only a few feet.
This prototype from Magpul looks like a box with a flashlight attached to it, but look a little closer and you'll see it's actually a submachine gun. It was developed as a personal protection weapon for the U.S. Secret Service or possibly law enforcement agencies. The gun is small enough to be disguised as a small package or laptop battery and can fit in a pants pocket.
No, it's not technically a gun, but it does shoot. This knife was designed as a self defense weapon for divers and shoots out a blast of C02 with the press of the button. Theoretically, the C02 would rush into a shark's blood stream and either freeze or over-inflate its internal organs. The knife packs a compressed-gas punch of 800 psi nearly instantly.
Pictures of this gun have been floating around on the internet for awhile now. Is it real? Is it a fake? Nobody really knows. There are examples of 3-barreled pistols but most of them have the barrels stacked on top of each other, not all lined up side by side.
