Are you saying that you didn't use a lightsaber at all? I mean comon your not trying to pull one over on me, are you? You took out everyone in the game with a some dinky pistol or clumsy rifle, right?
The most highly damaging ranged weapon I say in the entire game, if I remember correctly, was a disruptor rifle, got off a dead mercenary by Calo Nord on Water-Fish-Planet. It did, I think, 7-16 damage. My current character does 16-40 damage not to mention hitting twice since it's a double lightsaber.
I frankly don't believe you when say "only using ranged weapons." At least make your lie a little more believable next time and say something like "the Jehanie Super Zapping Insti-Kill Cannon was AWESOME"
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The most damaging ranged weapon [that isn't bought on the Yavin station] is the sith assassin pistol you get from Saul's corpse. It can do 9-21 points of damage if you have the specialization feat for pistol.
Ps: Someone please correct me if I'm wrong.