Edited sentence: AR-15s or similar rifles were the primary weapons used in around half of the 10 deadliest mass shootings in modern American history, including the 2012 Sandy Hook Elementary School shooting, the 2015 San Bernardino attack, the 2017 Las Vegas shooting, the 2017 Sutherland Springs church shooting, and the 2018 Stoneman Douglas High School shooting.According to a 2013 analysis by Mayors Against Illegal Guns 14 out of 93 mass shootings involved high-capacity magazines or assault weapons.An AR-15-style rifle was reportedly one of five guns used in the March 15, 2019 New Zealand Christchurch mosque shootings.Following the use of a Colt AR-15 rifle in the Port Arthur massacre, the worst single-person shooting incident in Australian history, the country enacted the National Firearms Agreement in 1996, restricting the private ownership of semi-automatic rifles with a capacity of more than 5 rounds (Category D).Gun expert Dean Hazen and mass murder researcher Dr.Most gun killings in the United States are with handguns.Nevertheless, AR-15 style rifles have played a prominent role in many high-profile mass shootings in the United States and have come to be widely characterized as the weapon of choice for perpetrators of these crimes.Pete Blair think that mass shooters' gun choices have less to do with the AR-15's specific characteristics but rather with familiarity and a copycat effect