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Mark, there is a +1 (7rd) Magazine available : https://www.ebay.com/p/SIG-Sauer-SIGTac-MAG-238-380-7-X-P238-Magazine-380-ACP-7-Round-X-Grip-Steel/15003301944 (Buds has it at a higher price) : https://www.budsgunshop.com/catalog/product_info.php/products_id/74357/sig+sauer+mag2383807x+380+380+automatic+colt+pistol+%28acp%29+7
If anything, you can add 1 round extra with the right gear. This gun was not made for large parts that will contradict its purpose; concealed carry.
the highest is a 7 round mag https://www.budsgunshop.com/catalog/product_info.php/products_id/74357/sig+sauer+mag2383807x+380+380+automatic+colt+pistol+%28acp%29+7
