A reproduction of Mal's bronze handgun surrounded by screen-used props
Volcanic Repeating Pistol - .41 "Rocket Ball"
Mal's Pistol in the TV series.
Replica of Mal's Pistol in the movie.
The signature pistol of Captain Malcolm Reynolds (Nathan Fillion) is a Taurus Model 85 revolver completely covered by a brass casting which makes it look like an semi-auto handgun. The look of the weapon is based on the Volcanic Repeaters used in the Civil War (pictured below) as explained by Firefly creator Joss Whedon in the visual companion. In the Firefly universe, the gun is a "Moses Brothers Self-Defense Engine Frontier Model B".
The same prop gun was used for the feature Serenity, but given to a new prop house who made the magazine straight on the bottom, bulked up the right side plate, and added a spring loaded rear sight.