The creation of home-made 3D printed weapons is on the rise among so-called 'sovereign citizens', a global expert warns.
"There is an attitude shared among these people which is very anti-authoritarian, often influenced by far-right extremism, and there's a disturbingly long history of violence," Adelaide University Associate Professor Joe McIntyre warns.
"They don't want to pay their tax, they don't want to pay their mortgage or their child support, and once you start thinking that law is optional and discretionary, you start to pick and choose which laws you will obey.
"And that gets us to the violence. I'm going to make a threat because I'm not bound by laws and limits. And suddenly I'm not bound by gun registration, so I'm going to do what I want.
"And so, you get this really dangerous connection between rejection of government authority and law, and this leads to the gun space.
"We have a very large and significant movement that is deliberately placing itself outside of the law and we have technology which allows them to make weapons in their back shed."
Associate Professor McIntyre was awarded his PhD from Cambridge in 2013.
His recent research at Adelaide University includes the publication last year of a definitive research piece on sovereign citizens, co-writing the book Pseudolaw and Sovereign Citizens.
Along with co-author Dr Harry Hobbs from the University of New South Wales, Associate Professor McIntyre hosted the world's first pseudolaw conference in Sydney in 2023, developing a global network of researchers, and he has recently returned from a conference in London.
"We've been studying this in a way that's just not happening anywhere else in the world," he says.
"And that's been really unexpected to find ourselves the global experts in this emerging discipline."