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. Meprolight provides comprehensive solutions with a wide array of combat-proven products; Electro-optical and optical sights and devices, night vision devices, thermal sights, laser rangefinders, hand held rangefinders and fire Control systems and other tritium illuminated products and accessories for safety and security applications. Unequaled Low Light Performance One of the Brightest Night Sights Available Today Used by Military & Law Enforcement. All Tru-Dot sights are covered by a 12 years usable illumination warranty to original purchaser. The ML - 10224 family of sights is meant for use on the 9mm, .357 Sig, .40 S&W and .45 GAP caliber pistols. These would be the G17,19,22,23,31,32,33,34,35,37,38 and 39 Gap Caliber.