It’s more that using multiple barrels keeps any one barrel from heating up too quickly, and it’s easier to have multiple barrels than entire firing assemblies.
Sure, but realistically air isn’t a good enough heat conductor for this to help much. Fixed machine guns used to use water-cooling but that’s been phased out and modern weapons simple replace the barrel when it gets too hot.
It’s more that using multiple barrels keeps any one barrel from heating up too quickly, and it’s easier to have multiple barrels than entire firing assemblies.
Not only that but the barrel is rotating quite fast which encourages cooling.
Sure, but realistically air isn’t a good enough heat conductor for this to help much. Fixed machine guns used to use water-cooling but that’s been phased out and modern weapons simple replace the barrel when it gets too hot.