How many firearms are lost or destroyed in the United States? Is the number of guns in the U.S. increasing or decreasing? The current estimate of the private stock of firearms in the United States is about 363 million (16 million were added in 2013). That number was calculated by the cumulative addition of domestic manufacture plus imports minus exports. This does not count guns shipped to the U.S. military. The figures are rounded to the nearest million. Firearms manufactured before 1899 are not included. The starting figure in 1945 is 47 million. The numbers do not account for...