Ruger Convertible models come equipped with an extra cylinder and are popular with shooters who appreciate the classic single-action revolver but opt for the versatility of being able to use more than one caliber in their handgun. With its interchangeable cylinder, Convertible models can be easily converted from one caliber to another without the use of tools. This versatility allows avid shooters of autoloading pistols to enjoy shooting a classic American single-action sidearm with their favorite pistol cartridge. The 357 magnum models come with an extra 9mm Luger cylinder.