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Good morning Douglas. The Black Mamba will accept MK IV 22/45 magazines. See here >>> https://www.rimfirecentral.com/threads/black-mamba-vs-ruger-mark-iv-22-45-magazines.1204399/ And here >>> https://volquartsen.com/media/product/1304-magazine-for-black-mamba-and-mk-iv-22-45 Stay safe & have a great day!

Douglas, yes sir, this takes standard MK IV 22/45 magazines. This includes two 10 round magazines. If interested here's a link to spare mags........................ https://www.budsgunshop.com/product_info.php/products_id/27183/ruger+90599+mark+iv+22+45+22+long+rifle+lr+10+rd+blued+finish ........................... Volquartsen sells one with a base plate from them that is supposed to help feeding reliability. Unfortunately buds doesn't have any in stock. If interested in the ones with their base plate just Google the upc (810162018108) and you'll find them. Hope this helps.

Hi Douglas and welcome to the community. Standard MK4 Magazines are compatible. Recommended spare mags if desired are here : https://www.budsgunshop.com/product_info.php/products_id/27183/ruger+90599+mark+iv+22+45+22+long+rifle+lr+10+rd+blued+finish - Cheers and stay safe!

Yes, this will accept the standard MK IV 22/45 magazines. This model comes with (2)-10 round mags. If you'd like to order spare mags here's a link to do so. https://www.budsgunshop.com/product_info.php/products_id/27183/ruger+90599+mark+iv+22+45+22+long+rifle+lr+10+rd+blued+finish