DALLAS (CBSDFW.COM/AP) — Bids are starting at $25,000 for the sale of the rifle used by Charles Whitman during his deadly 1966 sniper rampage from atop the University of Texas clock tower.

Sixteen people were killed and dozens were wounded in the Aug. 1 attack.

The bids are being accepted on the website of Texas Gun Trader. Donald Weiss of Dallas tells the Houston Chronicle he’s helping the unidentified owner of the Remington 700 to sell the weapon. Weiss says there’s a pending offer of more than $25,000 from a man in the Southeast Texas town of Orange.

The weapon is described as a “Remington 700 ADL, 6 MM CAL with Leupold scope.”

Weiss says the owner obtained the rifle from Whitman’s estate and will provide documentation to prove its authenticity.

Police who made their way to the top of the UT tower shot and killed Whitman after the former Marine spent more than an hour firing on people below.

(©2014 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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