What is a characteristic of the M203 grenade launcher?

The M203 grenade launcher is characterized as lightweight, single shot, and having a pump-action mechanism. This design allows for it to be easily attached to a variety of rifles, particularly the M16 and M4, enhancing its portability and minimizing its weight for infantry use. The single-shot capability means that it is designed to fire one round at a time, requiring the user to load a grenade into the chamber after each shot. This makes it efficient for precise engagements and ensures that the soldier can maintain control over the weapon's firing sequence. The term "pump action" suggests that it has a mechanism similar to that of a shotgun, where the user manually cycles the action to load the next round, although it is actually a breech-loaded weapon. The overall design emphasizes mobility and ease of use in combat situations, making it an effective tool for infantry units.