Which would you take: Pen or Pipe gun? (11 Photos)

They,re very simple. so called "zip guns" like this only have 1 moving part plus a spring.
it operates by unscrewing the barrel, and placing a round in it. you then screw the loaded barrel back on. to fire you draw back in the small knob on the side of the gun, this is connected to the only moving part. A firing pin with a coil spring behind it. let go of the knob and the firing pin will slam forward and set off the cartridge.