Should the gunner pull the trigger at the moment the tank encounters an irregularity in the terrain, oscillation of the gun barrel will cause misalignment of the laser beam, delaying the FCS from activating until the beam is immediately re-aligned.
Should the gunner pull the trigger at the moment the tank encounters an irregularity in the terrain, oscillation of the gun barrel will cause misalignment of a laser beam between an emitter at the top of the barrel and a receiver at the base. This will delay the FCS from activating until the beam is immediately re-aligned.