The M4 Carbine is a lightweight, air-cooled, gas-operated rifle used primarily by the United States military. It is a variant of the M16 rifle and features a shorter barrel, making it more maneuverable in close quarters. The M4 is chambered for the 5.56x45mm NATO cartridge and can be fired in both semi-automatic and fully automatic modes. Designed for versatility, the M4 can be equipped with various accessories, such as scopes and grenade launchers. Its modular design allows for easy customization, enabling soldiers to adapt the weapon to different combat situations. The M4 has become a standard issue for many military forces around the world.