What an early 5-inch/54 gun would change in the wartime US Navy

How much would an autoloading 5-inch/54 have changed the US Navy if available before the Second World War?

With a suitable powered mount it could improve later destroyers and carrier batteries, but the proven 5-inch/38 would probably remain on ships already optimized for mass production.

The gun alone is not enough because its heavier barrel and ammunition demand a powered mounting with rapid training, elevation, and loading. If that complete system existed before the war, production pressure would probably keep Fletcher-class destroyers on the proven twin 5-inch/38. Later Sumner and Gearing classes could instead receive single 5-inch/54 mounts, while Essex-class carriers might replace their twin 5-inch/38 batteries with the new weapon. The answer distinguishes a promising ballistic design from the machinery needed to make it an effective fleet anti-aircraft system.