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Robert, yes Sir it will. There is also a much slimmer profile 15rd version that is much more ergonomic as well : https://www.budsgunshop.com/product_info.php/products_id/714025798

Yes, this will fit and function just fine. Your emperor arms cobra 12 will take AR12 magazines and mka 1919 magazine's like the one you posted. Hope this helps.

Robert, yes this will work in the Cobra 12, it takes 1919 style magazines. Have a great day!