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REF fleet synchro cannon firing

Robotech: The Shadow Chronicles

A Main Gun was a somewhat generic term assigned to the primary artillery battery of a large ship.

The beam of Main Gun was so wide and powerful that is was primarily used to completely obliterate an enemy ship or squadron of fighters / smaller vessels. They tend to have used a great deal of energy and could not be fired continually.

The SDF-1's reflex cannon and the Icarus' Synchro Cannon fell into this category.