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Michael, yes, if it is chambered in 6.5 Grendel it will work. Radical takes standard AR15 magazines. Have a great day!

Michael, as long as your radical firearms is chambered in 6.5 Grendel this will fit and function just fine. Hope this helps.

Michael, yes Sir it will if chambered in 6.5 Grendel. 7.62x39 here : https://www.budsgunshop.com/product_info.php/products_id/82709/promag+cola-20+ar-15+magazine+30rd+762x39mm+blued+steel