What round does the M320 grenade launcher fire?

The M320 grenade launcher is designed to fire 40 mm grenades, making it compatible with a range of ammunition types used in modern warfare, including high explosive, smoke, and non-lethal rounds. This caliber is standardized for many grenade launchers used by various military forces, allowing for interoperability and ease of logistics. The choice of 40 mm rounds provides a balance between effective firepower and manageability in terms of recoil and weight, which is crucial for soldiers in diverse combat situations. The launcher is also modular, allowing for attachments that enhance its versatility on the battlefield.