All those primary-secondary-tertiary turrets have nearly same stats, so there's no actual difference. I removed some of them only because Freelancer (that's a well-known game engine flaw) does not provide sound for double or triple-barrel guns. Whatever sound you assign, it will be silent when shooting. So I simply left only one type of turret (one with only one barrel) for all capital ships, except for Kusari Dreadnought.