if you want the exact factory kit, you may have to ask any dealer to special order it through a distributor like Freedom Ventures. You could probably build that kit though easier or faster then buying one. Buy the gun in 44 or 50 then buy the parts (just the barrels, bolt assembly for 357, mags). Freedom Ventures has all the part for sale, but I gather they have agreements with dealers not to retail the actual guns. I noticed Profit River also has some barrels.