Is it possible to train gorilla or chimpanzee to use firearms?

How good is their finger dexterity? Do you need to mod the grips and triggers for their hands?|||Pulling the trigger would be the easy part, I'd be more concerned with thier aim. |||dido but training would take time reward them when they do good, etc. HMMM Are you in some elaborate plot to take over a small country with an army of crazed inaccurate shooting monkeys?