If the machinist is a physical class, why does the gauss attachment magically hang in the air just beyond the gun barrel(s) with no visible means of support? I suppose it might depend on non-magical electromagnetic or plasma fields of some sort, but if we have that sort of tech, why are we shooting bullets and not bolts of degenerate neutron matter or particle beams? "Aether" is not an answer because that's the catch-all medium of magic and magical damage in this game.

It's a conundrum wrapped in a paradox, just like the class.