Maglite Companion
The joint product of Maglite and CSG, this is a working flashlight with a .410 gauge barrel. It is of course single shot. Note the pin; the barrel is on the opposite end of the flashlight. You pull the pin then release a bolt held in place in a slot. Interesting concept but this would call for point blank encounters since you have no sights and only one shot.
(Source: gunrunnerhell)