Guns are piled inside a crate outside a police station in Tucson, Ariz., Tuesday, Jan 8, 2013, during Tucson City Councilman Steve Kozachik's gun buy back program. Kozachik asked people to turn in their guns for a $50 gift certificate to a Safeway grocery store. Tuesday marked the second anniversary of when a gunman opened fire on former Rep. Gabrielle Giffords as she met with constituents in 2011, killing six people and leaving 12 others injured. (AP Photo/Brian Skoloff)

Associated Press
Guns are piled inside a crate outside a police station in Tucson, Ariz., Tuesday, Jan 8, 2013, during Tucson City Councilman Steve Kozachik's gun buy back program. Kozachik asked people to turn in their guns for a $50 gift certificate to a Safeway grocery store. Tuesday marked the second anniversary of when  a gunman opened fire on former Rep. Gabrielle Giffords as she met with constituents in 2011, killing six people and leaving 12 others injured. (AP Photo/Brian Skoloff)
Guns are piled inside a crate outside a police station in Tucson, Ariz., Tuesday, Jan 8, 2013, during Tucson City Councilman Steve Kozachik's gun buy back program. Kozachik asked people to turn in their guns for a $50 gift certificate to a Safeway grocery store. Tuesday marked the second anniversary of when a gunman opened fire on former Rep. Gabrielle Giffords as she met with constituents in 2011, killing six people and leaving 12 others injured. (AP Photo/Brian Skoloff)
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