In an April 2018 review of mass shootings in the us, 99 mass shootings have occurred since 1982, from which approximately 76 semi-automatic handguns and 89 assault weapons and weapons with high magazine capacity were recovered.

On May 18, 2018, a teen shooter used a shotgun and a .38-caliber revolver that he took from his father to kill 10 people and wound 10 others at Santa Fe High School in Texas; this marked the 1,686th mass shooting since Sandy Hook Elementary School in December 2012.

In 2017 alone, 11 mass shootings in the US caused 117 fatalities and 587 injuries occurring in concert, religious, workplace, airport, and shopping venues and in the community.

At Sandy Hook Elementary School in Newtown, Conn. in 2012, Adam Lanza reportedly fired more than 150 shots in less than five minutes from his assault-style rifle with a high capacity magazine.

On June 12, 2016 at Pulse Nightclub, a single shooter killed 49 people and injured 53. It was the worst mass shooting in US history until the mass shooting in Las Vegas in October 2017 took 58 lives and left 546 injured. 

In February 2018, a school shooting at Marjory Stoneman Douglas High School in Parkland, FL left 17 people dead and 14 wounded. The teen shooter used an AR-15 semi-automatic style weapon, the same weapon used during the 2012 shooting at Sandy Hook Elementary School.

States that restrict assault weapons also have the lowest per capita homicide rates. However, because guns are easily trafficked in interstate and international commerce, federal rules are needed.

Researchers from Harvard School of Public Health demonstrated that from 1982 to 2011, mass shootings occurred every 200 days on average. From late 2011 to 214, they found mass shootings had occurred at triple that rate—every 64 days on average