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Christopher, no Sir this Fits the Ruger Mark III 22/45 and Mark III 22/45 Lite Rimfire Pistols ONLY. The Magazine you need is : https://www.midwayusa.com/product/1006197066/ruger-magazine-ruger-mark-iii-mark-iv-22-long-rifle-10-round-steel-blue

no that mag is for the 22/45 not the mk IV the MK IV hunter use the same mags a the MK III here is the single mag https://www.budsgunshop.com/catalog/product_info.php/products_id/12920/ruger+90231+mark+iii+magazine+10rd+22lr But for just a little more you can get the TWIN pack https://www.budsgunshop.com/catalog/product_info.php/products_id/39179/ruger+90645+ruger+mark+iv%2fmark+iii+22+long+rifle+10+rd+black+finish