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no the22/45 MK III mags do not work in the 22/45 mk IV here is the correct mag for the MK IV 90599 https://www.budsgunshop.com/product_info.php/products_id/27183/ruger+90599+mark+iv+2245+22+long+rifle+(lr)+10+rd+blued+finish
Rob, the Mark IV 22/45 Magazine is different design magazine catch notch and you will need https://www.budsgunshop.com/product_info.php/products_id/27183/ruger+90599+mark+iv+2245+22+long+rifle+(lr)+10+rd+blued+finish -- Cheers and stay safe!
no the22/45 MK III mags do not work in the 22/45 mk IV here is the correct mag for the MK IV 90599 budsgunshop.com/product_info.php/products_id/27183/ruger+90599+mark+iv+2245+22+long+rifle+(lr)+10+rd+blued+finish
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Rob, no you want this one >>> https://www.budsgunshop.com/product_info.php/products_id/27183/ruger+90599+mark+iv+2245+22+long+rifle+(lr)+10+rd+blued+finish .....Have a great day!