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yes it will fit

yes it will fit

Aaron, yes it will fit the FNS-40. You may also want to consider a lower profile "Combo" unit : https://www.budsgunshop.com/catalog/product_info.php/products_id/80337/Streamlight+69240+TLR4+Weapon+Light+w%2FLaser+CR2+Lithium+Blac

yes it will fit .......I have the "TLR4" mounted on a Glock 19 for thump in the night duty. Take note as mentioned above!!!! For $11.00 more you can have the combo . . . . Lite only . . . . . or lite & laser . . . . . or Laser only .......still fits the FN. thats a good add !