there is little chance that it will work in the United States.
The simple political reality is that we have a much stronger gun culture and 80,000,000 gun owners with 300,000,000 firearms. Gun owners vote and they do not support draconian gun bans such as was implemented by this individual in his home nation. Any attempt to accomplish what he was able to achieve in Australia could lead to an insurrection and the break up of our nation right down the middle rather than North and South. Such activities MIGHT fail in the end but the bloodshed and damage to our society would outweigh any advantages that would be achieved.
We do have a major problem with gun violence in our nation but we can significantly reduce it by passing reasonable effective laws and changes to our current laws coupled with better enforcement and improvements in our mental heath care system. We could probably reduce gun violence in half by merely realizing that our War on Drugs was lost decades ago and legalizing many drugs. Chicago had many gun deaths last year and most were caused by drug gangs fighting over turf.
The bottom line is that it is far easier to ban and confiscate firearms in a society that far fewer gun owners and firearms than our nation.
Reality is a bitch.
But of course I might be wrong. For those who feel that we should ban evil looking rifles or even all semi-auto firearms and even those who feel we should ban all civilian firearms I can only suggest you keep trying as you must feel that you are fighting the good fight. I may personally disagree with you but in our form of democracy you have every right to attempt to change our laws. I hold no animosity toward you. Call your elected representatives and donate generously to gun control organizations. If you wish change you must realize that talk is cheap and action might just work. Of course I will suggest the same for those who strongly support gun rights. Let's have a good debate and a fair fight and let the best side win.
I seriously hope that in the end we will end up with some truly reasonable changes to our gun laws that will reduce gun violence and make mass murder a true rarity.