Gun On Space Station

As part of their survival gear, Russian cosmonauts have long had a gun on the International Space Station. Of course, any bullet fired on the Space Station would puncture the thin metal skin and expose the inhabitants to death by rapid decompression, so the gun must be meant for conditions on the ground encountered after an descent gone awry. Still, with the real potential of crazy astronauts, a gun is the last thing they should have up there. Actually, with yesterday's college shooting as a fresh example, the same applies down here too.