45K views · 280 reactions | The M203 is a single-shot 40mm grenade launcher designed for use with the M16 rifle and other similar rifles, allowing infantry to engage targets at greater range and firepower than a standard rifle. #engineering | Interesting Engineering | Facebook

The M203 is a single-shot, 40 mm under-barrel grenade launcher, originally designed by the U.S. military, that attaches beneath a rifle and is compatible with various weapons. | Military Mechanics