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Robert, the Shield is a Single Stack design and the Shhttps://www.budsgunshop.com/product_info.php/products_id/134508/smith+%26+wesson+m%26p+9+shield+plus+9mm+13+1ield Plus is a Double Stack design :

Robert, this includes two single stack magazines. One extended 8 round magazine and one flush fit 7 round magazine. Hope this helps.

Robert, the M&P Shield M2.0 9 mm uses single stack magazines. Have a great day!