As I have shown before, rifles are used rarely for murder. Assault style rifles are a subset of rifles,, which means less than 17 murders happen per year in GA since before you were old enough to legally own a firearm. Even if assault style weapons were fully banned, that does not begin to be proactive, as it is unlikely that the murders would have just given up on killing their victims - they would have just used a different weapon.
If you want proactive legislation, you should focus on the source of the problem, not the tools used. Wouldn't it be better to focus efforts on people, and their mental state, rather than inanimate tools?