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Firearms Training Unit Detective Barbara J. Mattson of the Connecticut State Police holds up a Bushmaster AR-15 rifle, the same make and model of gun used by Adam Lanza in the Sandy Hook School shooting, for a demonstration during a hearing of a legislative subcommittee reviewing gun laws, at the Legislative Office Building in Hartford, Conn., Monday, Jan. 28, 2013. The parents of children killed in the Newtown school shooting called for better enforcement of gun laws Monday at the legislative hearing. (AP Photo/Jessica Hill)

Associated Press
Firearms Training Unit Detective Barbara J. Mattson of the Connecticut State Police holds up a Bushmaster AR-15 rifle, the same make and model of gun used by Adam Lanza in the Sandy Hook School shooting, for a demonstration during a hearing of a legislative subcommittee reviewing gun laws, at the Legislative Office Building in Hartford, Conn., Monday, Jan. 28, 2013. The parents of children killed in the Newtown school shooting called for better enforcement of gun laws Monday at the legislative hearing. (AP Photo/Jessica Hill)
Firearms Training Unit Detective Barbara J. Mattson of the Connecticut State Police holds up a Bushmaster AR-15 rifle, the same make and model of gun used by Adam Lanza in the Sandy Hook School shooting, for a demonstration during a hearing of a legislative subcommittee reviewing gun laws, at the Legislative Office Building in Hartford, Conn., Monday, Jan. 28, 2013. The parents of children killed in the Newtown school shooting called for better enforcement of gun laws Monday at the legislative hearing. (AP Photo/Jessica Hill)
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