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Kirk, you would need : https://gunmagwarehouse.com/ruger-mark-iv-22-45-22lr-10-round-magazine.html

Kirk, unfortunately, those won't work. The Mark II mags are different from the Mark III & IV mags, and they seem to be out of stock everywhere. BTW--the previous answer links you to Mark IV magazines, which won't work, they are the same one's you're asking about.