George Zimmerman, whose killing of unarmed black teenager sparked nationwide protests, has re-listed the gun that he used to shoot and kill Trayvon Martin in 2012 on a separate auction site.
"The firearm for sale is the firearm that was used to defend my life and end the brutal attack from Trayvon Martin on 2/26/2012," wrote Zimmerman, of the gun.
Zimmerman had previously listed the weapon, a Kel-Tec PF-9 9mm, on GunBroker.com, at a starting price of $5,000. He said in the listing that the gun had recently been returned to him by the U.S. Department of Justice and was a "piece of American History."
He wrote that the gun was fully functional despite "attempts by the Department of Justice on behalf of B. Hussein Obama to render the firearm inoperable."
GunBroker.com removed Zimmerman's listing before the auction was able to start, stating on its website: "Mr. Zimmerman never contacted anyone at GunBroker.com prior to or after the listing was created and no one at GunBroker.com has any relationship with Zimmerman… We want no part in the listing on our web site or in any of the publicity it is receiving."
Zimmerman re-listed the firearm Thursday on UnitedGunGroup.com, also for a starting price of $5,000. The listing seemed to be briefly removed overnight before reappearing again.
At time of writing, the auction, which is set to be open for five days, had received over 8,000 bids with the price up to $42.3 million. CNBC was unable to verify, however, how real the bids are; some bidders had listed their names as 'Donald Trump' and 'Racist McShootface.'
Todd Underwood, owner of UnitedGunGroup.com, told the Washington Post on Thursday: "As long as all laws are being followed, he [Zimmerman] can list the gun on our site. I don't support it, I don't condone it, I don't have anything against it. It's his property, it's his decision."
However, it was unclear if Zimmerman's listing was still up – CNN reported receiving an email from Underwood saying that an official statement regarding the sale of the weapon would be released Friday at 10am ET.
Zimmerman had also claimed that the Smithsonian Museum in Washington, D.C., was interested in buying the weapon, but the Smithsonian tweeted: "We have never expressed interest in collecting George Zimmerman's firearm, and have no plans to ever collect or display it in any museums."
The Trayvon Martin case sparked outrage when Zimmerman, a neighborhood watch volunteer, shot and killed 17-year-old Martin in Sanford, FL.
Zimmerman alleged that Martin was acting suspiciously and wearing a 'hoodie,' a hooded sweatshirt, that he refused to remove. Zimmerman called the police from his car but before they arrived, Martin was shot and killed. Zimmerman claimed he was acting in self-defense after Martin attacked him, an allegation that was never confirmed.
Zimmerman was first not charged in Martin's death, but after protests, he was later tried for second-degree murder but found not guilty. The verdict kicked off the "Black Lives Matter," movement, where Americans across the country protested against what they believed to be unjust killings of young, black men, by figures of authorities.
UnitedGunGroup.com has not responded to CNBC's request for comment.