Great for target practice, the Kimber(R) Rimfire Target Conversion Kit turns your .45 into a .22 LR in about one minute. Features adjustable sights and includes one 10-round magazine. Compatibility: All Kimber .45 ACP pistols that have either 4 or 5-inch barrels and single stack magazines. Also fits most other brands of Mil-Spec 1911. Not for Ultra models *Will not work on Taurus PT 1911 may not work on Para GI Expert.