Talk:381mm/50 Triple Gun Mount Kai/@comment-24786587-20150428140401/@comment-26114359-20150428143958

You don't fire both in a battle. It's either the main gun will fire but the AA crews evacuated first or only the AA will fire. Main guns aren't used for AA work anyway since there are no rounds for them specifically designed for AA work. This only applies for the US.

The IJN on the other hand doesn't since they have the type-3 shell for their main gun so they can fire both AA guns and main guns at the same time with consequences of course for the AA crew. It's not effective in the end either way in shooting down planes.