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Message: <blockquote data-quote="KroyWen" data-source="post: 4362558" data-attributes="member: 47342">Found This ;<h3>Ruger MK4 Magazine Compatibility</h3>Based on the search results, Ruger MK IV magazines have a notch for the mag release, which is different from MK II magazines. MK II magazines do not have this notch. Additionally, Ruger MK III and IV magazines are interchangeable, but MK II magazines are not compatible with MK III and IV.It is also mentioned that the base plate of MK IV magazines (including the 22/45 model) is shorter than those of MK II and III magazines, which are longer due to the heel release design. However, it is suggested that grinding off 1/4 inch of the base plate might allow MK II magazines to work in both MK III and IV pistols.In summary, while MK II magazines might be modified to fit MK IV pistols, they are not designed to be compatible without modification. Therefore, it is recommended to use Ruger MK IV magazines specifically designed for the MK IV pistol to ensure proper function and reliability.</blockquote>