MakerShot Simple Loader - Speed Loader Combo Pack: Single Stack + Double Stack Step 1: Select your magazine style (single stack or double stack) and # of loaders above. Step 2: Verify your pistol compatibility below. Single Stack Compatibilities: Smith & Wesson 22a, Victory ; Beretta U22 Neos ; Browning Buck Mark ; Ruger Mark I, Mark II, Mark III, Mark IV, 22/45, 22/45 LITE. Double Stack Compatibilities: Smith & Wesson M&P 22 Full Size, M&P 22 Compact ; Walther P22, P22Q ; Sig Sauer Mosquito ; Ruger SR22