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I have an M&P 40, as well well as regular S&W 40 and I can't use them interchangeable.

Hi Stewart, no sir, this will not fit the Shield pistols. Stay safe & have a great day!

Good morning to you!! No the regular size magazine will not fit a shield. See the link below https://www.budsgunshop.com/product_info.php/products_id/18210/promag+standard+9rd+40+s%26w+fits+s%26w+m%26p+shield

Hi Stewart and welcome. Unfortunately, no, as the shield uses a different magazine design. https://gunmagwarehouse.com/xtech-tactical-mtx-2-1-magazine-extension-for-smith-wesson-m-p-shield-9mm-40s-w.html ------------ Cheers and stay safe!