Auto 9

The Auto 9 is a specialized battle pistol with several technological features, utilized solely by the titular character of the Robo-Cop franchise.

Features
Using 9x19mm Parabellum ammo, a single Auto 9 magazine can hold up to 50 shots and is holstered in Robo-Cop's thigh, which mechanically slides open and closed to make a container for the firearm. Other than its extremely destructive armor piercing ammo that fires in a three round burst, it can fire explosive, non-lethal, and flechette.

Trivia

 * The Auto 9 was modeled after the Beretta 93.
 * The firearm is poked at in Sin City where an antagonist wields a gun extremely similar to it.