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This takes any glock double stack 40sw magazines there are a few drum mags available, buds has the one by KCI in stock here....................
/>https://www.budsgunshop.com/product_info.php/products_id/713087439/kci+usa+inc+magazine+for+glock+.40..................--------------------------

Timothy, the RWB will work Sir : -- https://www.classicfirearms.com/glock-40-caliber-50rd-drum/

Buds has several in stock mags here..............https://www.budsgunshop.com/search.php/type/magazines/caliber/10000719-40+smith+%26+wesson+s%26w/other/in_stock/q/glock+magazines

Timothy, this takes Glock 22/23 style magazines. Here's a link to a 30 round magazine if interested........... https://www.budsgunshop.com/product_info.php/products_id/24333/ets+fits+glock+22+23+24+27+35+-+30rd+.40+mag+length+210mm............ And here's a link to a 50 round drum Magazine.........https://www.budsgunshop.com/product_info.php/products_id/713087439/kci+usa+inc+magazine+for+glock+.40........ Hope this helps.