not to rain on your parade...
it sounds like a good idea...
but the idea sounds like a rail gun that fires plasma.
also in the atmothsphere the plasma would cool down relitivaly, giving it small range, not long range,
other than that, good idea, now if you coul;d figure out how to add it, go for it.
EDIT: OP3 id DEAD... incase you did not know...