The Maglula X12-LULA and T12-LULA set is two loaders designed for loading .22 LR single-stack, wider magazines with a projecting side-button. These loaders help hold down the projecting side-button to allow loading of your .22 LR magazines very easy. T12-LULA is a spring-loaded loader and the X12-LULA is a sliding loader. Fits: .22 LR wide body magazines (more than 7/16") single-stack magazines with a projecting side buttonWalther P22/G22Ruger SR22Smith & Wesson M&P .22Colt 1911 .22Walther PPK/S .22 (only the T12-LULA) FeaturesHighly reliableEliminates finger pain and injuryLoads up to 1 round per second