seems to be a term
mostly used in conjunction with role playing games
to describe that set of weapons
which fire some object
using a mechanical device
is not projected by human force
I believe the role playing connection comes from the fact that in the real world we do not have the contrast between laser guns, guns that shoot pure force blasts, etc. We have to rely on good ol' slug throwers, and thus there are not these category distinctions one finds in the settings of science fiction and role playing games.