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Llewellyn, no, currently the 14rd Magazine is it. https://www.budsgunshop.com/catalog/product_info.php/products_id/38879/European+American+Armory+14+Round+10MM+Witness+Magazine+w%2FBl
You can get all the 20 round magazines you want from MBX magazines. The 40 cal for the Witness will work. I have 2 for my Witness Extreme and they fit my 10mm Witness Hunter. https://mbxextreme.com/index.php?page=caspian_141_25_40mag
on my guns the 10mm mags will work just fine in the 40S&W But the 40 S&W mags will not work with the 10mm rounds it is to short (front to back) as the 10mm is a longer 40 S&W so I would stay with the 14 round 10 mm mags https://www.budsgunshop.com/catalog/product_info.php/products_id/38879/European+American+Armory+14+Round+10MM+Witness+Magazine+w%2FBl
