I picked up a Uberti 1860 Colt Army with a shoulder stock. The revolver came with a 45 Colt conversion cylinder, so I'm waiting till I get my percussion cylinder in before I use the stock with it. It is a fast change from cartridge to percussion, but you have to remember to never use the shoulder stock with the conversion cylinder because feds will rule that an SBR under the NFA - 5 years flat time.