How naval guns are renewed through relining

Are naval gun barrels stored rifled, and how are they reconditioned?

The rifled liner is fitted inside the barrel and can be replaced repeatedly as the gun wears.

Barrel relining begins with heating the outer barrel so the worn liner can be removed. A new rifled liner is then fitted and secured as the assembly cools. The liner takes the wear from repeated firing and can be replaced many times during a gun's career. This maintenance cycle keeps the main barrel in service without replacing the entire weapon after its rifling wears out.