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How would the Battle of Britain have been impact had all the RAF's Spitfires and Hurricanes been armed with reliable 20mm cannons?
This would entail the Spitfire Mk.V's armament of 2x20mm cannons and four x.303 mgs for all the RAF's Spitfires in the BoB.
And for the Hurricanes, it's four 20mm cannons of the Mk IIC.
