Rail-guns work by propelling their projectile along a magnetic track, or “Mag-rail”.
They are limited in both range and power by the length of the mag-rail.
For every 2 studs of mag-rail length, add 1d6 of damage, and 6” of range.
Rail-guns are rated by the size of their mag-rail, a two stud long mag-rail is classified as a category 1,
or cult. 1, a four stud long mag-rail is a cult. 2, and so on et cetera.
See? very simple, yet realistic as far as how railguns really work.
All feedback welcome.