S.I.A.C.E. makes (or at least made in fairly recent times) a lovely back action hammer gun. I believe it sold as the "Concordia" here, although it's labeled as the 370B on the S.I.A.C.E web site (https://www.siacearmi.com/en/products-k2-2/hammer-guns/item/184-370b.html). I have one in 28 gauge with 29 inch barrels. They are very nice shotguns and it's one of my go-to clays guns.