Removed destroyer mounts could return on new ships

What happened to gun mounts removed when destroyers received new anti-aircraft weapons?

They were reused on destroyers still moving through production rather than automatically being scrapped or transferred to merchant ships.

Removed destroyer mountings did not simply disappear from the fleet's accounts. They could be fitted to new destroyers already moving through the production system. Reuse conserved manufactured equipment while refitted ships received the weapons demanded by newer air-defence priorities. This is a small but concrete example of wartime material management across repair and construction programmes.