The M16 rifle is a lightweight, air-cooled, gas-operated assault rifle that was first adopted by the U.S. military in the 1960s. It fires the 5.56×45mm NATO cartridge and is known for its accuracy and high rate of fire. The rifle has undergone several modifications over the years, leading to various models, including the M16A1, M16A2, and M16A4. Designed for versatility, the M16 can be used in different combat situations. It features a magazine capacity of 20 or 30 rounds and can be equipped with various accessories, such as scopes and grenade launchers, enhancing its effectiveness on the battlefield.