LOS ANGELES, CA - MAY 31:  A surrendered TEC-9 style gun is seen at a gun buyback event that was announced by Los Angeles Mayor Eric Garcetti in the wake of a killing spree at University of California, Santa Barbara that left six students dead, on May 31, 2014 in Los Angeles, California. People can exchange their firearms with no questions asked at four Los Angles-area locations for Ralphs supermarket gift cards ranging from $100 to $200 per weapon. The buyback program first took place in Los Angles in 2009 as part of the Gang Reduction and Youth Development program to reduce the number of guns on the streets. The last buyback resulted in more than 1,500 firearms being turned in. (Photo by David McNew/Getty Images)