"Compared with pistols, assault rifles are used rarely in shootings. According to F.B.I. statistics, 374 people were murdered with any kind of rifle in 2016; 7,105 were killed by a handgun. But the AR-15 has been a recurring character in some of America’s most infamous violent crimes. Adam Lanza used his to kill 20 children and six educators at Sandy Hook. Stephen Paddock used an enhanced AR-style gun to kill 58 concertgoers and wound hundreds on the Las Vegas Strip in October. A month later, Devin Kelley murdered 26 congregants with a Ruger AR-15 variant at a church in Sutherland Springs, Tex. And the rampage last month at Marjory Stoneman Douglas High School in Parkland, Fla., renewed calls for assault-style rifles to be banned — a common refrain after mass shootings."