It’s been almost four years since Florida teen Trayvon Martin died at the hands of George Zimmerman, in part sparking the Black Lives Matter movement. But the former neigbhorhood-watch coordinator is stirring controversy today after reportedly deciding to auction the gun he used to shoot Martin, and claiming in a post on GunBroker.com that the Smithsonian Institution had inquired about it.

The Smithsonian fervently denied that claim this morning:

The online-auction post apparently authored by Zimmerman, who told WOFL FOX 35 that he was going to sell the 9mm pistol as “a free American,” reads:

“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. The gun is a Kel-Tec PF-9 9mm. It has recently been returned to me by the Department of Justice. The pistol currently has the case number written on it in silver permanent marker. Many have expressed interest in owning and displaying the firearm including The Smithsonian Museum in Washington D.C. This is a piece of American History. It has been featured in several publications and in current University text books. Offers to purchase the Firearm have been received; however, the offers were to use the gun in a fashion I did not feel comfortable with.”

Zimmerman was acquitted by a Jury in 2013. He was subsequently arrested for alleged domestic violence.