P-40B - 2x12,7mm (.50) MGs at the top of the engine cowling, 4x7,62mm (.30) MGs in wings. The RAF Tomahawk Mk.IIA - 2x12,7mm (.50) MGs and 4x7.7mm (.303) British MGs in wings.
P-40C and the RAF Tomahawk Mk.IIB - 2x12,7mm (.50) MGs at the top of the engine cowling, 4x7,62mm (.30) MGs in wings.