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David, yes, this is compatible with AR12 style magazines and mka 1919 drums and magazines. If interested here's a link to a 20 round drum that will fit............................ https://www.budsgunshop.com/product_info.php/products_id/111608/promag+mkaa1+akdal+12+gauge+mka+1919+2.75+20rd+black+drum ............................. Here's a link to the 15 round drum............................... https://www.budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+2.75+15rd+drum ............................. And here's a 10 round magazine if interested......................... https://www.budsgunshop.com/product_info.php/products_id/127318/sds+imports+t10rdm+replacement+magazine+12+gauge+sds+imports+10rd+black+detachable ..................... Hope this helps.

Hi David, the 15rd Drum is perfect as the 20rd Drum will have your arm in an unnatural chicken wing position : https://www.budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+2.75+15rd+drum - Cheers and stay safe!