Australian Prime Minister Malcolm Turnbull has said about 51,000 illegal firearms, a fifth of all illegal guns in the country, were surrendered in a three-month amnesty ending today. <br/><br/>Speaking to reporters in Sydney, Turnbull said, Australia's tough gun ownership laws, which ban all semi-automatic rifles and semi-automatic shotguns, severely limit the chances of a Las Vegas style mass shooting. <br/><br/>The three-month amnesty was the first in 20 years in Australia and the weapons collected will be destroyed. According to a government statement, among them were 19th-century guns, a homemade machine gun, a rocket launcher and a pistol small enough to fit in the palm of a hand.<br/><br/>Australia's tough gun ownership laws were introduced after the massacre of 35 people by a lone gunman at the former prison colony of Port Arthur in the island state of Tasmania in 1996.