Original: The nose was designed to carry two .50 in (12.7 mm) M2 Browning machine guns, with 200 rpg, two .30 in (7.62 mm) Brownings, with 500 rpg, and an Oldsmobile 37 mm (1.46 in) cannon with 15 rounds.
Simplified: It could carry 4 machine guns and a cannon.