The Maglula X10-LULA and V10-LULA set is two loaders designed for loading .22 LR single-stack, narrow 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. The V10-LULA locks itself anywhere along the magazine while the X10-LULA slides along the magazine. Fits: .22 LR narrow body magazines (less than 3/8") single-stack magazines with a projecting side buttonRuger MKI, II, III, 22/45Beretta U22 NEOSBrowning BuckMarkColt Woodsman/CadetHigh-Standard .22Smith & Wesson 22A/22S FeaturesHighly reliableEliminates finger pain and injuryLoads up to 1 round per second