That's in "33", and I think it was for the upper main battery guns. Galactica's main battery is more flexible then Pegasus', mounted upper (presumably lower too, but there's never been a good shot of the underside of the ship AFAIK) in full turrets rather then forward-mounted fixed. Less rate of fire, but twice as many guns (not counting the underside ones which may or may not exist). It probably all works out to about the same. And Galactica's main battery capable of damaging a Basestar; witness the salvo fire it put out in "Resurrection Ship, Part II".