.22LR is cheaper ammo than .45ACP
Kimber rimfire conversion kits work with all Kimber .45 ACP pistols that have either 4 or 5-inch barrels and single stack magazines. They also fit many different brands of 1911 pistols. Field installation takes about one minute and no modification is required. Conversion kits are not classified as a firearm and can be purchased directly from Kimber.