The MP 40, or Maschinenpistole 40, is a submachine gun developed in Nazi Germany during World War II. It was designed for use by infantry and paratroopers, featuring a simple blowback operation and a folding stock for ease of transport. The MP 40 fired 9mm rounds and had a magazine capacity of 32 bullets, making it effective in close-quarters combat. The MP 40 was widely used by German forces and became iconic due to its distinctive design and association with World War II. Its popularity has led to its continued presence in popular culture, often depicted in films and video games related to the era.