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Marlin, yes Sir, this model has a Manual Thumb Safety : -- https://www.budsgunshop.com/product_info.php/products_id/24040/smith+%26+wesson+m%26p+m20+40s%26w+425+15%2b1

This firearm has a model with the safety. It was my pleasure to assist you.

some M&P s have safeties and some dont you will have to check the specific model UPC that you want