The Beretta M9 is a semi-automatic pistol that has been the standard sidearm for the United States Armed Forces since 1985. Chambered in 9mm, it features a double/single action mechanism and a 15-round magazine capacity. Its design emphasizes reliability and ease of use, making it suitable for military and law enforcement applications. The M9 is known for its durability and accuracy, with a barrel length of 4.9 inches. It has a polymer grip and an aluminum frame, contributing to its lightweight nature. The Beretta M9 has been widely adopted by various military and police forces around the world.