Using its long range and high speed, the G4M could appear from any direction, and then be gone before many fighters could intercept them. The 20 mm cannon in the tail turret was much heavier armament than commonly installed in bombers, making dead astern attacks very dangerous. Near the end of the war, the Betty was used as a common kamikaze-carrying and launching platform, and was the usual aircraft for carrying the Ohka kamikaze rocket aircraft.
Armament included a dorsal turret featuring a 20 mm cannon; 2 20 mm Type 99 cannon; tail turret, top turret, 4 7.7 mm Type 92 machine gun; nose, waist, cockpit . The G4M2 carried bombs; 1 1,055 kg (2,326 lb) Type 91 Kai-7 (improved model 7) aerial torpedo bomb or 1 ? 800 kg (1,760 lb) bomb or 2 500 kg (1,100 lb) bombs or 1 Type 3 - 800 kg (1,760 lb) no.31 ray-detective type bomb + 12 60 kg (130 lb) bombs.