If by “nobody” he means nobody but socialist governments, the answer is 200 million during the 20th century.
And if everyone had a gun roughly the same number of people would get killed. Studies of European countries shows no correlation between gun restrictions and murder rates.
And that was when Piers' head exploded...
Fact #1, Russia has some of the most restrictive gun laws in the world, no Russian civilian can legally possess a firearm except licensed hunters during hunting season.
Fact #2, Russia's murder rate is now almost 4 times that of the US.
Conclusion: gun control causes 4 times more murders than free access to guns causes.
Those statistics are the findings of a 2007 study of European gun laws and crime statistics.
"In an independent research paper titled Would Banning Firearms Reduce Murder and Suicide?, first published in Harvards Journal of Public Law and Policy, Don B. Kates, a criminologist and constitutional lawyer, and Gary Mauser, Ph.D., a Canadian criminologist and professor at Simon Fraser University, examined the correlation between gun laws and death rates."