it uses a 4 round detachable Savage box magazine (budsgunshop.com/catalog/product_info.php/cPath/26_27/products_id/53210/Savage+55105+10%2F11%2F12+243+Win%2F308+Win+4+rd+Matte+Blued+Finish). 10rd magazines are also available here : budsgunshop.com/catalo