The Ameriglo Green Tritium Single Dot, No Outline .165" Square Notch Rear Sight is designed to fit Smith & Wesson M&P models (excluding .22, .380, Shield, EZ, and Pro). Featuring a green tritium insert without an outline, this rear sight provides excellent visibility in low-light conditions. The .165-inch square notch offers a clear and precise sight picture. Ideal for self-defense and tactical applications, this rear sight ensures reliable performance and enhanced accuracy.