I've often wondered why Marlin hasn't come out with one, but there may be market problems. If you're going to get a levergun and you want max. power, the .444, .45-70 or .450 Marlin would all be superior to a .454 Casull. If you want a handy carbine, Marlin and Winchester have a bunch of models in .45 Colt, .44 Mag., etc. As a handgun cartridge, the Casull is at the limits of the possible. Yet when moved to the world of leverguns, the Casull fits in an akward zone between rifle cartridges and standard handgun/levergun cartridges. It's less powerful than the big rifle cartridges, but it's got a *lot* more kick and PSI than the typical carbine cartridges. That said, I've heard a lot of people asking for one.