General Motors War Products Training Service Book - 'How The Gun Works - Caliber .50, M2 Browning Machine Gun'. P/b, approx. 12x9cms. Jan. 1943 dated, 32p. Describes/illustrates the weapon with three types of barrels for various applications. Information and diagrams of the parts and how the gun works. Brownings were used in the wings and turretts of many AAF and RAF aircraft. Excellent condition. Stock code P15504.