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Kent, this is compatible with the ProMag MKA-1919 Drum but (this is a Pump and the drum would be awkward) : https://www.budsgunshop.com/product_info.php/products_id/714020477/promag+mka+1919+12ga+275%22+20rd+drum

I've not met many people that have ran promags without serious reliability issues, I would stay away from Promag personally, did find one at tooth and nail armory that runs in the same platform here https://www.toothandnailarmory.com/product/20rdDrum.html