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His energy weapons skill is pretty low so he probably will not use it unless it is the only thing is has. Make sure that is the only weapon he has, there is ammo for it, and he is not set to melee mode. I do not recommend giving him one though. He is much better with small weapons and explosives and he will almost always prefer a shotgun over anything else. ( Charon Shotgun is superior to prety much any weapon u will give him )