Every defensive pistol should have quality night sights and the Ameriglos are as good as any. My M&P Shield was a reliable, accurate pistol, but it grouped noticeably low. Istalling the Ameriglo SW-800-210 Short Front was the ticket for moving the groups closer to point of aim. Be warned that the original sights on some M&Ps are difficult to remove due to extremely tight dovetail slots. I made a bronze (harder than brass, softer than steel) punch to drive them out. After that the installation was pretty straight forward. If your M&P shoots low this shorter front sight will almost certainly help.
Pros: Perfect for fixing M&Ps that shoot low
Cons: None
This review was written in the old system and had content requirements that are different than reviews written today.