Maglula .22LR Narrow Loader Highly durable polymer construction 1/3 the time loading several mags with thumb Designed to load/unload .22 LR single stack narrow body magazines with side button For Ruger MK I, II, III, 22/45, Browning Buck Mark, Beretta U22 NEOS, Colt Woodsman/Cadet, High Standard 22, S&W 22A/22S (only X-10 Lula) Eliminates thumb pain and injury Protects fingers from pinching Indifferent to magazine length Highly reliable