Welcome Cesar. The model would help. But if the front sight is integral (part of) the slide, you would need to have it machines out for a new one. That would mean choosing a new front and matching rear sight. And unless the rear sights match the fronts (height wise), you would need to replace the rear sights too. Good luck with that.
--- Joe --- Tanfoglio Witness PS 9mm Grey Ghost with 22LR Conversion Kit