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Hi Geff and welcome. Yes Sir. 15rd Drum fits better (much less of an awkward chicken wing stance due to the width of the 20rd drum) : https://www.budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+2.75+15rd+drum

Geff, yes you can use this 20rd drum in the TBP12, https://www.youtube.com/watch?v=0S2Md6CotiA Stay safe & have a great day!

Geff, yes this will fit and function just fine. The TBP 12 takes AR12 style magazines and mka 1919 style magazines and drums like this one. If interested here's a link to a 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 link to a 10 round magazine that'll fit 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.

Absolutely. This will work just fine to give you the extra rounds you want.