The rifled barrels (if I recall correctly, "canon raye dispersant" was the description in French, which translates "rifled dispersion barrel") are still seen on some doubles made in Europe. Fabarms made some OU's a few years back with one rifled barrel, the other with choke tubes. Verney-Carron and Beretta made similar guns for the European market in the recent past, perhaps still do. Those models are often referred to as "becassier" in French: woodcock specials. In addition to one rifled tube, other typical characteristics are very short barrels and light weight.
