Hi Fernando, no sir, this will not work in the M&P Metal. For use in all Smith & Wesson **original** centerfire M&P models.
Not for use in the M&P M2.0 models (the Metal is a 2.0 model)
See Apex web site here >>> apextactical.com/flat-faced-forward-set-sear-trigger-kit-for-m-p
Stay safe & have a great day!

Hi Fernando and welcome. Yes, this trigger works with all S&W M&P pistols in all center fire calibers and configurations equipped with an Apex Forward Set Sear (excludes the Shield pistol). Cheers, stay safe and enjoy!

Designed to work in any Smith & Wesson M&P model pistol in a centerfire caliber, per description. Go to apex tactical to find more spec.
apextactical.com/smith-wesson/pistols/triggers-trigger-kits