The AR-15 rifle was developed in the 1950s by ArmaLite. It was designed as a lightweight and accurate rifle for military use. In 1963, Colt began mass production of the AR-15. The rifle was widely used by the military and police. AR-15 has a lot of modifications and variants. It can be equipped with different barrels, stocks, sights and other accessories. This makes the rifle versatile and suitable for various tasks. The main characteristics of the AR-15 include: caliber: 5.56 mm; magazine capacity: from 5 to 30 rounds; barrel length: 10 to 24 inches; weight: 2.5 to 4 lbs.