Thanks for updating the AR30 page with the specs. In doing a bit more research on this model I'm reading conflicting things on the bridge. Your source apparently say it's a Gibraltar, while others seem to indicate it's some sort of cheaper generic Tune-O-Matic.
Based on the photos I can find of (claimed) AR30s, it's almost certainly not an original Gibraltar bridge, which has a rectangular shape. Instead it could be a Gibraltar II, which has rounded ends. Or it may not be a Gibraltar at all.
Can you tell if the bridge on your guitar matches the images on the wiki of either the Gibraltar or Gibraltar II?