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the MK IV22/45 and the MK IV use different mags MK Iv mag https://www.budsgunshop.com/product_info.php/products_id/39179/ruger+90645+ruger+mark+iv%2fmark+iii+22+long+rifle+10+rd+black+finish MK IV 22/45 mags https://www.budsgunshop.com/product_info.php/products_id/39185/ruger+90648+ruger+22%2f45+mark+iv+22+lr++10+rd+black+finish
Mark, no Sir. They are currently inexpensive and plentiful however, I would stock up if you have a Mark IV. (2 Pack) here ---- https://www.budsgunshop.com/product_info.php/products_id/39185/ruger+90648+ruger+22%2f45+mark+iv+22+lr++10+rd+black+finish
James the mags you linked will not work with the pictured MK IV 22/45 the proper 22/45 mags are https://www.budsgunshop.com/product_info.php/products_id/39185/ruger+90648+ruger+22%2f45+mark+iv+22+lr++10+rd+black+finish