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Daniel, yes this will work in the BAT Bullpup, it takes AR12 and MKA style 1919 magazines and drums. Have a great day!

Yes, this will function just fine!!

Daniel, yes but, your shoulder and elbow will be at an odd angle (almost 90 degrees) due to the width of the drum. I have both and the much slimmer 15rd drum works much better on Bullpups. : https://www.budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+275%22+15rd+drum

Daniel, yes, the black aces bullpup takes AR12 magazines or mka 1919 magazines/drums. So this will fit and function just fine. Here's a link to a 10 round magazine that will also fit if interested. Hope this helps, link here....... https://www.budsgunshop.com/product_info.php/products_id/411559964/sds+imports+turkish+ar12+12ga+10rd+magazine