I had a browning with their 5" rifled tube and it shot as good if not better than a fully rifled barrel. In fact some of the reports that people did on browning said the same thing. But I believe it has to be a long rifled tube like the browning which will also fit mossberg 500and winchester. And the barrel has to be made for slugs with the same inside diameter at the chamber as at the muzzle to get that kind of accuracy. Just my few cents worth.