The robot still wouldn't want to shoot on auto. It might shoot as fast as auto, but it would want to decide & control when each round goes off, rather than rely on the fixed timing of the auto mechanism
I believe that is my point. The timing and strength has nothing to do with it. I was the commander's gunner on a .50 caliber machine gun because I was a good shot. The barrel "travels" upwards. It isn't really about holding it down, it is just the physics.