>latest estimates show there are between 400-500k firearms in private hands in the US.
…USA civilians account for an estimated 393 million (about 46 percent) of the worldwide total of civilian held firearms, or about 120.5 firearms for every 100 American residents.
From 1994 to 2023, gun ownership increased 28% in America. In 2023, about 16.7 million firearms were sold in the U.S. In the first four months of 2024, nearly 5.5 million firearms were sold, averaging around 1.3 million per month.
https://en.wikipedia.org/wiki/Gun_ownership