I need any solid* links proving gun violence decreases when there is an assault weapons ban

[gejohnston]

31. not quite true

they had two since then. One by arson. None by gun.
They didn't have any before the 13 year string of them either. It started with a shoot out between two rival gangs, and ended with Port Author. Since there was no change in gun laws that preceded it, one can't really conclude that gun laws had anything to do with it.

While suicide rates in Australia is trending down, Australia's gun ownership rate is about the same as it was before pre NFA and was never very high, at least compared to North America and Europe. In fact, It is lower than Iceland's.
In short, Australia's gun ownership rate is largely unchanged, maybe slightly higher or lower but suicide rates are still dropping. That could have to do with a Labour govt being in charge instead of the right leaning Liberal party. BBC did a study showing a correlation that Australia's suicide rate rises during a right of center government and drops during a left of center government, a trend that has been consistent for at least 100 years. NFA was put in place when right winger John Howard was PM.