Why did Spitfires change their guns? Ft. Jonathan Ferguson
This is one of Imperial War Museums’ most prized possessions. A genuine, airworthy, combat-veteran Spitfire Mk 1. Early Spitfires were initially equipped with eight machine guns. They fired the 303-rifle calibre machine gun round. But much like the Spitfire through its development, not only did it gain things like bigger engines, but also a larger armament. In the case of the 20mm cannon and the .5-inch machine gun.
Credit to : Imperial War Museums