From The Guardian:

Americans own an estimated 265m guns, more than one gun for every American adult, according to the most definitive portrait of US gun ownership in two decades. But the new survey estimates that 133m of these guns are concentrated in the hands of just 3% of American adults – a group of super-owners who have amassed an average of 17 guns each.

The unpublished Harvard/Northeastern survey result summary, obtained exclusively by the Guardian and the Trace, estimates that America’s gun stock has increased by 70m guns since 1994. At the same time, the percentage of Americans who own guns decreased slightly from 25% to 22%.