As you mention the sound I'd like to add a very short part of an anecdote that was told to me by P-51 'Ace' Art Fiedler.
He recalled the first time he fired his guns as it went something like this;
"I got my sights on the target and squeezed the trigger......I nearly jumped out of my skin as the roar of the guns was so loud! It doesn't sound anything like you hear in the movies, you can't here the guns, it's just a load roar and vibration!"
Cheers, MP
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