It is set at .5, MA is at 1.0, it still hits the same but it does less damage per hit.
Some/most CT maps have larger numbers of AA guns per field than fields do of comperable size in the MA, some fields also have no maned AA gun's. So you have a lot more ack in the air over many fields thus you are more likely to get Pinged. On the Curent map their is only one maned gun per field(prety shure about this), and the ack is aranged in a circular maner, for me it is harder to set up to atack and i seam to get pinged more on it as a result.