George Zimmerman Relists Trayvon Martin Gun

George Zimmerman has relisted the gun used to kill Trayvon Martin ... less than 2 hours after it was yanked from its original auction site.

The Kel-Tec PF-9 9mm just went up at unitedgungroup.com -- the listing and starting bid of $5,000 remains the same.

A spokesperson for unitedgungroup.com says he got in touch with Zimmerman through a mutual friend once the initial listing was removed. He tells us unitedgungroup.com's stance on the controversial item is if it's legal, they have no objections and it "comes down to a moral decision for George to do what he wants with his property."