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Franscisco, Bud's has a 9 round magazine in stock >>> budsgunshop.com/product_info.php/products_id/18210/promag+s%26w+shield+40sw+9rd+bl+steel

Francisco, an extended option is here : https://www.budsgunshop.com/product_info.php/products_id/18210/promag+s%26w+shield+40sw+9rd+bl+steel ------------------------------------- Cheers and stay safe!

Francisco, the highest capacity magazine I'm finding for the M&P40 is one from promag that holds 9 rounds. Here's a link to one if interested.................... https://www.budsgunshop.com/product_info.php/products_id/18210/promag+s%26w+shield+40sw+9rd+bl+steel ..................... Or they also make +2 round magazine extension that works with your factory magazines. Here's a link to the +2 extension if interested..................... https://www.budsgunshop.com/product_info.php/products_id/42805/strike+siempmps+s%26w+m%26p+9mm+40+smith+%26+wesson+s%26w+magazine+extention+polymer+black+finish ..................... Hope this helps.

As mentioned, the highest magazine round count available for this is a 9 round which Bud's carries.
https://www.budsgunshop.com/product_info.php/products_id/18210/promag+s%26w+shield+40sw+9rd+bl+steel

Other than that, you can also purchase a 2 round extender!!

https://www.budsgunshop.com/product_info.php/products_id/42805/strike+siempmps+s%26w+m%26p+9mm+40+smith+%26+wesson+s%26w+magazine+extention+polymer+black+finish

Franscisco, Bud's has a 9 round magazine in stock >>> budsgunshop.com/product_info.php/products_id/18210/promag+s%26w+shield+40sw+9rd+bl+steel