Star Wars Armada: MC30c Frigate - Rules of Play says:
One of the most powerful mid-level ships in the Galactic Civil War, the MC30c frigate was of Mon Calamari design and presented a lethal combination of speed, high-powered armament, and advanced deflector shields. The trade-off, however, was that the ship was relatively light on hull plating.
Of course, as with other Star Wars Armada expansion packs, the MC30c Frigate Expansion Pack also comes with two ship cards that let you field your MC30c as either the MC30c Scout Frigate or MC30c Torpedo Frigate. Though they share many of the same design elements, the different costs and battery armaments of these two different configurations ensure a wide range of tactical flexibility for your MC30c.