The M16 rifle is a lightweight, air-cooled, gas-operated assault rifle that was first adopted by the United States 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, resulting in various models, including the M16A1, M16A2, and M16A4. Designed for versatility, the M16 can be used in different combat situations, making it a popular choice among military forces worldwide. Its modular design allows for the attachment of various accessories, such as scopes and grenade launchers, enhancing its functionality on the battlefield.