A modern five-inch system transported to 1925

What changes if a modern U.S. five-inch weapon system is transported back to 1925?

Air defense, surface fire control, and shore attack improve dramatically because the transported package includes sensors and control systems as well as guns.

The decisive change would be the complete sensor, fire-control, and ammunition system that accompanied the gun. Radar and modern control equipment would transform air defense, surface fire, and shore bombardment in an interwar fleet. Even a ship with only a few single mounts could be far more effective than its silhouette suggested. Designers might adapt the weapon into twin mountings, while Britain would urgently seek access to the technology.