About WW2 fighter aircraft firing power

[Stewart]

Infact I agree with you that the USAF might have done better by adopting a cannon like the Hispano or the MG 151. However, it's not the point discused here. I dispute this idea! That the USAF shot down many more Axis planes than any of, or possably all of the other Allied powers is not open to dispute! Given that the allies planes all had about the same performance Vs their Axis opponents, yet scored so much better, both in absolute numbers and as a ratio of the number of missions representing opportunity.
That the Germans chose to use guns not well suited to shooting fighter planes, but which were much better at bombers is a politicle desision.