Chapter 5 Weapons

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.50-caliber Air-Cooled Machine Gun

(M2-HB)

Operation Selective fire (fully or semiautomatic), air-cooled

Caliber .50 (12.7 mm)

Muzzle velocity 893 mps (2,930 fps) Capacity 110-round belt

Weight 57.6 kg (128 lbs) with tripod Overall length 165.4 cm (65.1 in.)

Rate of fire 450 to 550 rounds per minute Range 1,800 m (1,970 yds)

The predecessors of the .50-caliber machine gun were German 12.7- and 13.2-mm antitank rifles used in World War I. Early tanks had thin armor that was easily pierced by such rounds. The U.S.

Ordnance Department turned to John Browning to design a machine gun that would use a high-velocity

.50-caliber cartridge, and Browning delivered a prototype gun the day after the Armistice was signed. While the vast majority of U.S. .50-caliber machine guns (both air- and water-cooled) were used in aircraft or mounted on vehicles (tanks, halftracks, jeeps, and trucks), the M2-HB air-cooled model was issued to infantry units. Weighing nearly 130 pounds (with tripod), the M2-HB was used mainly as a defensive weapon.

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Microsoft Close Combat manual Caliber Air-Cooled Machine Gun M2-HB