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According to magnum research website you can, it requires a different magazine for each calibre as well but can be switched back and forth. https://www.magnumresearch.com/magnum-research-introduces-combo-caliber-package-for-the-desert-eagle/

Crystal, yes you can. The 44Magnum and 50AE can interchange barrels and magazines. Details : https://www.magnumresearch.com/magnum-research-introduces-combo-caliber-package-for-the-desert-eagle/