The heavy rifled barrel in previous post was made by Hastings for the Remington 870. It is 26" long and a muzzle diameter of over an inch. Hastings is gone now, but we'd like to find some of these barrels. The Hastings number of the barrel is 560H90.
In the meantime Remington has come out with their SPS Super Magnum Slug Gun with 25.5" rifled barrel and a 1" diameter muzzle, with more solid barrel, and extra pins in mounting barrel, so a scope can be put on action. Ed