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This uses a single stack magazine. Hope this helps

Jerre, this is a single stack magazine. >>> https://www.budsgunshop.com/product_info.php/products_id/712015982/sw+mag+m&p380+shield+ez+380acp+8rd .....Have a great day!

I know it's a single stack as my wife owns one. Very "EZ" to rack and takedown is simple.

Jerre, it is a Single stack magazine design. You can get a +1 floor plate here for 9 +1 = 10rds: https://gallowayprecision.com/plus-1-magazine-extension-for-smith-and-wesson-m-and-p-9-shield-ez-pistols