There are inertia triggers that will dry fire fairly reliably, but, from what I understand, Browning has made Superposed guns with true mechanical triggers. Trying to figure out what you actually have in your hands is difficult. Beretta, for one, converts inertia triggers to a very light touch, triggers that behave much like mechanical triggers. I own such a Model 682 that was converted at the factory to fire small gauge shells. I don't know what kind of trigger they put in their four barrel skeet sets.