The M203 Grenade Launcher is a single-shot, breech-loaded weapon designed to be attached to various firearms, primarily the M16 and M4 rifles. It fires 40mm grenades, providing infantry with the capability to engage targets at a distance with explosive projectiles. The launcher is lightweight and can be operated by a soldier with minimal training. Developed in the late 1960s, the M203 has been widely used by the U.S. military and allied forces in various conflicts. Its versatility allows for the use of different types of grenades, including high-explosive, smoke, and illumination rounds, enhancing combat effectiveness in diverse scenarios.