A look at military-style semiautomatic rifles

PHOENIX — Military-style semiautomatic rifles have been used in at least four high-profile shootings in the past year. Bushmaster variations of the weapon have been used in two recent attacks, including the Newtown, Conn., school shootings and the Christmas Eve ambush slayings of two New York firefighters. While commonly called the AR-15, Colt and Armalite have been the only companies to make weapons by that specific name. Many other manufacturers, however, now sell similar versions of the rifle largely styled after the military's fully automatic M-16.