The Probert Encyclopaedia of Warfare

BROWNING M2AA

The Browning M2AA (Browning M2) was an American air-cooled short recoil automatic heavy machine-gun originally developed for use in aircraft at the end of the Great War under the designation Model 21 (Browning M1921). The Browning M2AA was chambered for the .5 M2 Ball round which it took from a disintegrating link belt and fired with a cyclic rate of between 500 and 650 rounds per minute and a muzzle velocity of 893 meters per second . The Browning M2AA had a 1143 mm long barrel and was fitted with a blade foresight and a leaf aperture rearsight.
Research Browning M2AA