The Meprolight ML-11766 is a fixed set for the Smith & Wesson M&P full size and compact 9mm and .40 caliber pistols. Please note, S&W offers many heights of front sight. Meprolight produces the most common height. ul>Unequaled Low Light Performance Brightest Night Sights Available Today Used by Military & Law Enforcement All Tru-Dot(R) sights are covered by a 12 years usable illumination warranty to original purchaser Meprolight is a leading International Electro-Optics company, developing, manufacturing and marketing systems for infantry, armed forces, law enforcement agencies and civilian markets since 1990.