1 moa is 1/60th of 1 degree. So half that.
He is asking about muzzle movement, not POI movement.
To be honest, I have no clue how to do that math, but if I were to guess, I would say a human hairish. I really dont know if that is correct, its a guess. Keep in mind thats a human hair when the bullet exits the muzzle, not as you break the trigger.