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John, I'm not aware of any 30 round magazines but this will take AR12 magazines, mka 1919 magazines/drums and yes rock island armorys VR series magazines. Here's a link to a 10 round magazine........... https://www.budsgunshop.com/product_info.php/products_id/411559964/sds+imports+turkish+ar12+12ga+10rd+magazine.......... And here's a link to a 20 round drum that will also fit.............. https://www.budsgunshop.com/product_info.php/products_id/131370/sds+imports+t20rdm+replacement+magazine+12+gauge+sds+imports+turkish+1919+20rd+black+polymer+drum.......... Lastly here's a link to a rock island armory vr series 19 round magazine that will fit.......... https://www.budsgunshop.com/product_info.php/products_id/114563/rock+island+42379+vr+12+gauge+vr+19rd+black+detachable........ Hope this helps.

John, it will take any RIA VR-Series shotgun magazines. Word of caution, the fat 20rd Drum will have your arm like a pinned up chicken wing (almost 90 degree angle). The best compromise is the 15rd Drum : https://www.budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+2.75+15rd+drum ------------ and next being the 19rd stick magazine : https://www.budsgunshop.com/product_info.php/products_id/114563/rock+island+42379+vr+12+gauge+vr+19rd+black+detachable........

John, this will take Rock Island VR series magazines, as well as AR12 and MKA 1919 magazines and drums. budsgunshop.com/product_info.php/products_id/411559964/sds+imports+turkish+ar12+12ga+10rd+magazine ......budsgunshop.com/product_info.php/products_id/131370/sds+imports+t20rdm+replacement+magazine+12+gauge+sds+imports+turkish+1919+20rd+black+polymer+drum .......budsgunshop.com/product_info.php/products_id/114563/rock+island+42379+vr+12+gauge+vr+19rd+black+detachable .....Have a great day!