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In this Jan. 28, 2013, file photo, 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, during a hearing of a legislative subcommittee, at the Legislative Office Building in Hartford, Conn. (AP Photo/Jessica Hill, File)

In this Jan. 28, 2013, file photo, 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, during a hearing of a legislative subcommittee, at the Legislative Office Building in Hartford, Conn. (AP Photo/Jessica Hill, File)

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