The Lercker was a selective-fire machine pistol developed in Bologna, Italy after the Second World War.
Designed to appear and operate as a handgun, while firing as a fully automatic weapon, the Lercker was chambered for the 6.35×16mmSR Browning Auto (.25 ACP) cartridge, a small cartridge by post-war standards.
It was capable of firing at a rate of 1200 rounds per minute, a high figure for the time.
[1] The Lercker was introduced in 1950, but only about 150 of the guns were produced before production ended.
[2] The weapon was banned by the Italian government, as it was the functional equivalent of a submachine gun, but small enough to conceal easily.