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Quintin, A friend of mine bought a SKO-12, all of the MKA1919 mags we have tried in it have run perfectly with the exception of the last round hold open. The hold open works on some mags and not others. The hold open lever is longer on the SKO factory mag than it is on the 1919 mags and we believe that is the issue with the 1919s that fail to activate the bolt hold open.------https://www.budsgunshop.com/catalog/product_info.php/products_id/711009619/magazine+for+mka+1919+12+gauge+black+polymer+10+rounds---------https://www.budsgunshop.com/catalog/product_info.php/products_id/98217/promag+mka01+mka+1919+12+gauge+10+rd+black+finish