No disrespect intended, Mate and those are bice words.
But it begs the question, WHY would youse surrender your guns???
Depends on what you mean by "surrender". If you are referring to Australia not having something equivalent to the 2nd Amendment of the United States constitution:
Like Canada, Australia did not have a War of Independence from Great Britain, hence our constitutions developed differently. Thankfully, both Australia and Canada were able to develop with minimum violence, except for a few incidences like the Eureka Stockade (December 1854, ironically involving Americans as agitators, including an African American) and the Upper Canada Rebellion (again, Americans involved!) in December 1837.
A connection to Australia after the Upper and Lower Canada Rebellions:
In total 93 Americans and 58 Canadiens (French Canadian) prisoners from Lower Canada were transported to Australia after being convicted in Montreal in late 1838 or early 1839. Almost all were taken on the HMS Buffalo, leaving Quebec in September 1839 and arriving off Hobart, Van Diemen's Land in February 1840. The Americans were disembarked at Hobart but the French-Canadians were taken to Sydney, New South Wales. They were interned near the present day suburb of Concord, giving rise to the names Canada Bay, France Bay and Exile Bay. The French-Canadians were treated better than the Americans, liberated sooner and assisted in getting home. Of the 93 Americans, 14 died as a direct result of transportation and penal servitude. By the end of 1844, half of those in Van Diemen's Land had been granted pardons, nearly all were pardoned by 1848, but five remained in penal servitude until at least 1850. None chose to stay in Van Diemen's Land after being pardoned.
From Upper Canada (Ontario) 150 were sent to the penal colony of Van Diemen's Land (Tasmania) and Sydney, Australia.
The Eureka Stockade was a rebellion of miners in the goldfields of Victoria. It was a Battle fought between the Colonial forces of Australia and miners where 27 people died, mostly rebels.
Mass public support for the captured rebels in the colony's capital of Melbourne when they were placed on trial resulted in the introduction of the Electoral Act 1856, which mandated full white male suffrage for elections for the lower house in the Victorian parliament, the second instituted political democracy in Australia. As such, the Eureka Rebellion is controversially identified with the birth of democracy in Australia and interpreted by some as a political revolt.
Australia and Canada have had several massacres, most well known are the Port Arthur Massacre (Tasmania Australia 1996) which led to Australia handing in it's guns, and the École Polytechnique Massacre (Canada Montreal 1989) which also led to strict gun controls in Canada.
Neither country (Australia, Canada) has had any massacres since these gun control measures were enacted.