A M203 grenade launcher is attached to what type of weapon?

The M203 grenade launcher is specifically designed to be mounted underneath certain rifles, and the M16A2 is one of the primary platforms for this weapon system. The M203 adds versatility by allowing the operator to launch 40mm grenades while maintaining the use of the rifle itself. This combination enhances infantry capabilities on the battlefield, providing both direct fire from the rifle and indirect fire from the grenade launcher in a single unit.

While the M203 can also be mounted on other platforms like the M4 Carbine, the emphasis of the question is on the type of weapon that commonly features the M203 as a standard attachment. The M16A2 has historically been one of the primary military rifles equipped with the M203, illustrating its significance in the field of infantry combat.