In this Jan. 28, 2013, file photo, firearms training unit Det. 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. Ten states and nearly two dozen members of Congress are joining the National Rifle Association in supporting gun-maker Remington Arms as it fights a Connecticut court ruling involving the Sandy Hook Elementary School shooting. (AP Photo/Jessica Hill, File)
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