I have a perfect condition cantilever slug barrel for a Benelli Nova or Supernova. The barrel was made by Ithaca, and is chambered for 12 gauge 3" or shorter. I believe it is a 1:28" twist. These are impossible to find, and have not been made in quite some time. The one and only problem I've ever had is that some of the shell is exposed for the extractor. This caused some extraction problems on soft hulls like Fiocchi, but most were fine. I don't remember any problems with factory ammo. As odd as it sounds, one of the best shooting rounds I've found in this barrel was the Remington 3" 1 ounce Slugger. Mounted to it is a cheap Konus 1.5-5x scope. It's nothing spectacular, but works surprisingly well for what I paid for it. It has handled hundreds of rounds this far without an issue. I have not shot this barrel for years, and I think it is time to go to a better home. I would like $300 shipped