Squirt guns are typically non-lethal weapons used to deliver debilitating chemical agents.
30 pistols, rifles, and assault weapons
The commericaly available firearms of the Cosmic Era
The basics of magnetic weaponry in the Cosmic Era
Drawn from the rather generic Gunslinger Adept from Shadowrun, but influenced very strongly by the 2002 film Equilibrium and the 2008 Wanted.
A shape-shifter of some sort has taken up a post at the War College of an enemy realm, where he secretly picks off only the most promising officer cadets, arranging bizarre accidents that gradually debase the leadership of the hostile army. In the long run, this will improve his nation's chances when the inevitable conflict comes.
As a shape-shifter he can impersonate superiors and peers alike and send the target candidate to the cleverly-prepared site of his (or her?) execution. As long as he is successful, no-one will ever know about the deception--even necromancy will only implicate the one impersonated...