Matthew, this includes two 10 round ak style magazines but this model already includes a Glock magazine well adapter, so you don't have to purchase one separately to use Glock magazines. So this can use Glock 17/19 style magazines. Here's a link to a 31 round Glock magazine if interested. Hope this helps, link here........ budsgunshop.com/product_info.php/products_id/411559170/ets+fits+glock+17+18+19+26+34+-+31rd+9mm+mag+length+200mm

Matthew, I would get the Interface Plate & Glock Magazine Well Adapter to be able to use Glock and Glock style Magazines : - chiappafirearms.com/accessory.php?id=239 ---------------------- chiappafirearms.com/accessory.php?id=172