The M9 is a semi-automatic pistol that was adopted by the United States Armed Forces in 1985. It is chambered for the 9mm Parabellum cartridge and is known for its reliability and accuracy. The M9 was designed by the Italian firearms manufacturer Beretta and is officially designated as the Beretta 92FS in civilian markets. The M9 features a double/single action mechanism, allowing for both a double-action first shot and single-action subsequent shots. It has a magazine capacity of 15 rounds and is equipped with a safety/decocking lever. The M9 has been widely used in various military operations and has also been adopted by law enforcement agencies.