Submachine guns are a type of firearm that are designed to fire pistol cartridges and are typically smaller than other types of firearms. Two examples of submachine guns are the STEN and UZI. The STEN is a British submachine gun that was developed during World War II and was used by the British Army and other Commonwealth forces. The UZI is an Israeli submachine gun that was developed in the 1950s and has been used by military and police forces around the world.