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40.0 MW PDC 20km

This railgun is specifically designed to intercept high-velocity targets against your battleship. Compared to its power consumption( 40 MW) and weight( 3.44 tons) , this cannon can accelerate its bullets made of graphene to 18.7 kmps, while the spreading angle is fairly low at 0.00006°. You can add tens of such cannons onto your battleship, casting an iron curtain against any threats that flying towards your ship.