The Kimber Rimfire Compact Conversion Kit converts Kimber .45 ACP Ultra, Compact and Pro models as well as other brands of 1911 pistols into a .22 LR in less than one minute. This high quality unit fits most 1911-style, single stack handguns chambered in 45 ACP. (Not compatible with ramped barrel and will not work with a 1911 chambered in 40 S&W, 38 Super or 9mm Luger) These drop-in units require no modifications to your gun and do not require changing mainsprings. Conversion units will fit compact models, but the magazine will protrude slightly below the grip. Includes adjustable sights, travel case and a 10-round magazine. Kimber strongly recommends using only premium ammunition with plated bullets. Non-plated lead bullets may cause failures. Black.