There is no cheat, I'm sure of it, but there may be a mod. It would be easy to make, actually. Just make all the npcs use guns instead of sabers. But that wouldn't get rid of YOUR saber.
Anyway, I think that this game handles guns a lot better than sabers. The Quake 3 engine was meant for guns, so that, in turn, makes this game meant for guns.
Quake 2 player.
Real life player.