The Auto 9 is a highly advanced select-fire machine pistol with a 50-round magazine. It is holstered in a concealed alcove in RoboCop's thigh, together with at least one reload magazine in storage. The most commonly utilized fire setting is in a three-round burst mode; however, RoboCop has been seen firing a single round in multiple instances. The weapon is also capable of utilizing special ammunition, which can be selected by its user via the targeting interface.