"The types ko, otsu, and hei, the Ki 43-IA (2x7.7mm), Ki 43-IB (1x7.7mm and 1x12.7mm), and Ki 43-IC (2x12.7mm)." KI-43
THE ORIGINAL ARMAMENT
Both primary source documents and the general literature agree that the prototype and pre-production Ki 43-1's featured two armament combinations namely two 7.7mm machine guns or two 12.7mm "machine cannon " (in Japanese army parlance). The number 10 and 13 pre-production aircraft (serial numbers 4310 and 4313) carried two 12.7mm guns. The other prototype and pre-production aircraft carried two 7.7 mm guns [4].
Congratulations, you called me on a typo, F2A. Wanna cookie?
2 × 0.50 in (12.7 mm) nose-mounted M2 machine guns
2 × 0.50 in (12.7 mm) wing-mounted M2 machine guns
2 × 100 lb (45 kg) underwing bombs
(Wiki)
http://www.history.navy.mil/photos/ac-usn22/f-types/f2a.htm More reliable site.
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