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This works with mka 1919 or AR12 magazine or drums. Any of those wont require modifications. Sometimes new magazines or drums will fit very tight but after using them awhile will loosen up. Hope this helps.

Robert, no Sir. AR-12 Style magazines and drums will work : https://www.budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+275+15rd+drum -------------------------------- https://www.budsgunshop.com/product_info.php/products_id/111608/promag+mkaa1+akdal+12+gauge+mka+1919+275+20rd+black+drum