For a realistic recoil, there could be some wheels in places of the stand-legs, that would have a constant brake force applied. Then when firing, it would slightly push it away. But it had to have a variation od slip-coeficients for various surfaces, otherwise, it wouldnt look realistic on concrete vs. soil. But on vehicles, its easy. Will rock the suspension.
But it rotates a little bit too fast ... cant imagine wielding those levers like that.
( ... and i dont know how the ratio of rotation between the valves and the gun direction/elevation movement looks like. Couldnt find any info about it.)