Connecticut State Police Detective Barbara J. Mattson holds a Bushmaster AR-15-style rifle, the same type of gun used in the Sandy Hook shooting, during a 2013 hearing in Hartford, Conn. The gun-maker Remington is being sued by the families of the victims.

Connecticut State Police Detective Barbara J. Mattson holds a Bushmaster AR-15-style rifle, the same type of gun used in the Sandy Hook shooting, during a 2013 hearing in Hartford, Conn. The gun-maker Remington is being sued by the families of the victims.