Save on ammunition costs, hone your shooting skills, and just have fun. The 22LR Rimfire Conversion Kit is avaliable for Sig P220, P226, and P228/ P229. A complete replacement assembly, the rimfire conversion kit installs as easily as field stripping the pistol. Simply remove the standard slide assembly, slide on the rimfire conversion kit, add the included .22LR magazine, and you're ready. Features adjustable target sights and comes complete in a hard carry case. Holds 10 rounds max. NOTE : The .22 kit and magazines will NOT work with the old P220's with the European style bottom of magwell magazine catch.If you have a button magazine catch then they will work.