The Vickers 40 mm is a type of autocannon developed in the early 20th century, primarily used by the British military. It fires 40 mm rounds and is known for its versatility, being mounted on various platforms, including vehicles and aircraft. The weapon was designed to provide effective anti-aircraft and anti-armor capabilities. This autocannon saw extensive use during World War II and beyond, serving in various conflicts. Its design allows for a high rate of fire, making it effective against both ground and aerial targets. The Vickers 40 mm remains a notable example of early automatic weaponry.