TUCSON, Ariz. – Tuesday was not just a day for Tucson to remember the victims of the deadly shooting that severely injured then-U.S. Rep. Gabrielle Giffords. It was also a day when residents could see firsthand the nation's gun debate play out in a busy parking lot outside a city police station.

On one side was a councilman who supports gun control leading an effort to give $50 grocery store gift cards to anyone who turned in their firearms to police. On the other was an event organized by a state senator that turned into an open, unregulated and legal marketplace for firearms.

"We have a fundamental hole in the private sales of guns. You can walk up right in front of a cop and buy a gun, no background check, nothing," said Councilman Steve Kozachik. "How much more flawed can the system be?"