[Alneyan]

The Shield Depleting weapons area will do both: you will get Shield Depleters first (reduce Shield points, and only Shield points), and then Shield Disruptors (destroy the Shield Generator themselves).

The standard caveat for the Shield Disruptors: you need to do enough damage to take down one component per hit. If the weapon only does 30 damage points, it will not be enough to destroy a Shield Generator at 40 hitpoints, regardless of how many times you try. Shield Disruptors also have a low range and are very expensive, at least in the vanilla game (it is the same in Devnull, if memory serves).