At one point early yesterday, the bidding surpassed $65m (€57m) with the leading bidder using the screen name ‘Racist McShootFace’.
The website for United Gun Group began hosting the auction on Thursday after another website, GunBroker.com, took it down saying it wanted “no part in the listing on our website or in any of the publicity it is receiving”.
Hours later, United Gun Group tweeted that it would post Mr Zimmerman’s ad after all.
The site calls itself a “social market place for the firearms community”. Bidding on the 9 mm Kel-Tec PF-9 pistol began at $5,000.
Critics called the auction an insensitive move to profit from the killing. Mr Zimmerman had told Florida TV station WOFL on Thursday that the pistol was returned to him by the US Justice Department, which took it after he was acquitted in Trayvon’s 2012 shooting death.
The original listing said a portion of the proceeds would go towards fighting what Mr Zimmerman calls violence by the Black Lives Matter movement against law enforcement officers, combating anti-gun rhetoric of Democratic presidential candidate Hillary Clinton, and ending the career of lawyer Angela Corey, who led his prosecution.