from the VOX article...
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"One of the most significant provisions of the NFA was a flat-out ban on certain kinds of guns, such as automatic and semi-automatic rifles and shotguns. But there were already a number of such guns in circulation in Australia, and the NFA required getting them off the streets.
Australia solved this problem by introducing a mandatory buyback: Australia's states would take away all guns that had just been declared illegal. In exchange, they'd pay the guns' owners a fair price, set by a national committee using market value as a benchmark, to compensate for the loss of their property. The NFA also offered legal amnesty for anyone who handed in illegally owned guns, though they weren't compensated.
There were fears that the mandatory buyback would provoke resistance: During one address to a crowd of gun rights supporters, Howard wore a bulletproof vest. Thankfully, fears of violence turned out to be unfounded. About 650,000 legally owned guns were peacefully seized, then destroyed, as part of the buyback. According to one academic estimate, this amounted to about 20 percent of all privately owned guns in Australia."
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As mentioned...all it takes is for all the "Law Abiding and Responsible" gun owners to "Sacrifice" a class of firearms that has many other alternatives for 'Hunting', 'Target Shooting' and 'Home Defense'...so that the rest of society doesn't have to pay the price we're seeing today.
Link: https://www.vox.com/2015/8/27/9212725/australia-buyback