"Then make sure that both of the arms are IK linked to the gun. The gun will jump around and move the arms with it. Much easier." how do you do this? I tried the HI solver and the other IK stuff but that dotted line won't appear. also, I tried to link the forearm to other objects but it wouldn't work.
Yeah, that's why I said that I've had mixed results with adding a new controller to a Biped. Theoretically it should work, but I don't think it's stable yet. So the best option is to add the noise controller to the pos of the gun and then link the hands to the gun. Here's how you do it with Biped... Position the hands on…
Actually, now that I think about it, it would be better to assign the noise controller to the position of the gun, not the rotation of the arm. Then make sure that both of the arms are IK linked to the gun. The gun will jump around and move the arms with it. Much easier.