How would I go about making a mob shoot where I'm looking when I right click and am riding it? (UNSOLVED)

Hello, I am making a mod where I will need to have mechs or other vehicles shoot when you are riding them, but I am not sure how to go about that, If you have any ideas or solutions on how to do that, then please tell me, If this question has already been answered, then point me to that comment thread in the description please.