Who can still make a 12-inch naval gun?

Can anyone still make a 12-inch naval gun?

Sweden and Finland are offered as plausible candidates because they retain relevant barrel expertise, while the chat identifies Swedish large-scale precision machining.

The exchange shifts attention from old guns to the industrial knowledge and machine tools needed to make new ones. Sweden and Finland are presented as likely candidates because both have kept relevant large-barrel work going. Their ability to build a 12-inch gun remains theoretical rather than confirmed. Their recent entry into NATO gives that retained capacity a wider alliance context. Sweden's habit of developing its own weapons is linked to armed neutrality and domestic defence production. A viewer then cites a Swedish 72-metre five-axis mill with plus-or-minus five-micron accuracy, an example of the specialized machinery behind heavy-gun manufacture.