The gun is the sole surviving blaster prop remaining of the three used for filming the original Star Wars trilogy, according to RIAC.
Han Solo’s original blaster, used by Harrison Ford in Star Wars: A New Hope, is expected to fetch up to $500,000 (£410,000) when it goes under the hammer later this month.
In 2018, Han Solo’s blaster from Return of the Jedi sold to Ripley’s Believe it or Not! for $550,000.
The prop was based on the German-made Mauser C96, one of the first and most recognisable semi-automatic handguns ever made.