The ARES Defense Systems Company is currently selling a Mag-Light which is actually a .410 shotgun.
The weapon is called the Companion, and is a working flashlight capable of firing a .410 shotgun round.
The weapon works by removing a safety pin. The weapon can then be fired by a spring loaded firing pin. The projectile exits through the end cap.
The weapon can be purchased on the Internet.
It is also available in the Mini-Mag size which fires a .380 round.
ARES Mag-Light .410 Shotgun
End Cap
Mini-Mag that fires .380 round