Manuel, it is a very nice model 42, one I would be glad to own.  It is and was made to use, so go shoot some skeet with it.  I bet someone years ago was using it for serious skeet.  Having said that, some of the ones really serious about shooting top scores back in the day sleeved the barrels to get them a little heavier and more like the weight and balance of the model 12’s they shot in bigger gauge events.  I have a standard field model and once in a while have to get it out to shoot something.  Tim