Before you spend the gazillion bucks to send it to a pistolsmith, try painting the front sight. Birchwood Casey sells a pack of three paint pens - white, fluorescent green, and fluorescent red. You put two coats of white on the sight and top it off with your preferred color. I've got the red on three M10s, a M67, a M681, a M28, a M642, a M49, and a Detective Special. It really helps my geezer's eyes find the front sight. Other folks here have done a similar thing but using nail polish instead of paint.
Of course, if you just want a different front sight, rock on.