There are over 1 billion firearms in the world today, including 857 million in civilian hands — with American men and women the dominant owners, according to a study released Monday.

The Small Arms Survey says 393 million of the civilian-held firearms, 46 percent, are in the United States, which is “more than those held by civilians in the other top 25 countries combined.”

“The key to the United States, of course, is its unique gun culture,” the report’s author, Aaron Karp, said at a news conference. “American civilians buy an average of 14 million new firearms every year, and that means the United States is an overwhelming presence on civilian markets.”

The report said the numbers include legal and illegal firearms in civilian hands, ranging from improvised craft weapons to factory-made handguns, rifles, shotguns and, in some countries, even machine guns.

The estimate of over 1 billion firearms worldwide at the end of 2017 also includes 133 million such weapons held by government military forces and 22.7 million by law enforcement agencies, it said.