Total deaths in US mass shootings—defined as four or more people shot and killed in one incident, excluding the perpetrator, at a public place, excluding gang-related killings (en)
After the 2004 expiration of the Assault Weapons Ban, the firearms industry embraced the AR-15's political and cultural significance for marketing. Almost every major gunmaker produces its own version, with ~16 million Americans owning at least one. (en)
