Jim Davis wrote:

Surely you (or Discovery Wings) meant ten 12.7 mm (0.5") machine
guns?



That's what they obviously meant, but the narrator called them "50 mm
machine guns".
How would you like to be a waist gunner with one of those.... that would
be empowerment, wouldn't it?
The Germans did take after bombers with Me-410s armed with a single 50
mm cannon though.
They also shoehorned one of those into a prototype Me-262 jet's nose:
http://www.warbirdsresourcegroup.org...es/lrg0208.jpg

Pat