The Browning .50 cal AN/M2, often shortened to .50 BMG, is a fifty caliber machine gun. The full gun itself is approximately 1.3 meters long and weighs 0.04 tons. It carries no internal ammunition, and thus requires crates of ammo elsewhere on the vehicle to fire.
The Browning was developed by John Browning near the end of the First World War, in response to the need for a higher-caliber machine gun. Since the Second World War, this piece (in several different variants) has been used in nearly every major conflict to date, and is used by many other militaries due of its power and reliability.