Robert, yes Sir, the 15rd MKA-1919 drum is narrower and fits better and the 20rd drum is wider and creates a more unnatural shoulder angle on a bullpup : budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+275+15rd+drum ---------------------------- budsgunshop.com/product_info.php/products_id/111608/promag+mkaa1+akdal+12+gauge+mka+1919+275+20rd+black+drum />

Robert, yes this will take mka 1919 drum mags. >>> budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+275+15rd+drum ....or budsgunshop.com/community.php/q/view/q_id/70740/Total+length .....Have a great day!

Robert, yes Sir, the 15rd MKA-1919 drum is narrower and fits better and the 20rd drum is wider and creates a more unnatural shoulder angle on a bullpup : budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+275+15rd+drum ---------------------------- budsgunshop.com/product_info.php/products_id/111608/promag+mkaa1+akdal+12+gauge+mka+1919+275+20rd+black+drum

This will take AR12 magazines or mka 1919 magazines. Like item number MKAA1 just type the item number into buds search or just use buds search and type in AR12 magazine or mka 1919 magazine. Hope this helps.