Everyone expects the power armor trooper and his trusty combat rifle, assault rifle, storm-bolter, etc.
The ultra-rare and ultimate firearms favored by gun adepts, assassins, and snipers.
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.