M1919 Browning is a .30 caliber medium machine gun that was widely used during the 20th century, especially during World War II. The M2 Machine Gun or Browning .50 Caliber Machine Gun is a heavy machine gun designed towards the end of World War I by John Browning. Its design is similar to Browning's earlier M1919 Browning machine gun, which was chambered for the .30-06 cartridge.