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Shotgun:In 1984, two German inmates used bedposts, pieces of lead from curtain tape, match heads, AA batteries and a broken light bulb to create this. They took a hostage and ultimately escaped by car. (Source: Viral Nova)
Shanks:An inmate at Baraga Maximum Correctional Facility put several layers of toilet paper together, hardened it and used it as a shank. The weapon was eventually found and seized.
Double barreled pistol:In 1984, two Celle prison inmates were found with this and other firearms they were able to make in the prison's metal shop.
Radio transmitter:Technically not a weapon, but still a forbidden item. A prisoner in a Wolfenbüttel, Germany facility used this to be aware of random searches for weapons and other contraband.
Knuckleduster:Found in an American prison in 1993, this was probably made from a rasp in a workshop. Simple weapon, but still effective.
Whip:In 1996, while searching a Santa Fu jail cell in Hamburg, Germany, officials found this monster. A regular whip with a bonus feature -- razors.
Tattoo Gun:An inmate grabbed this tattoo gun, modified it and had himself a nice homemade weapon until officials finally confiscated it.
Dummy submachine gun:Using grease injector, wood, a rubber sleeve, and tape, an inmate being held at a Wolfenbüttel, Germany facility was able to fashion this thing.
Crossbow:Now this is scary. Using 10 toothbrushes, a cigarette lighter, a section of ballpoint pen casing, a piece of wire coat hanger, a section of a pair of aluminum cafeteria tongs, assorted electrical components, pieces of yellow rubber gloves, some Kleenex, a piece of string, and a few screws, an inmate created a weapon that could fire 40 feet. Yikes.