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.
Shortly after his activation, RoboCop was assigned the Auto 9 as his primary weapon and he has used it as his main weapon ever since. A unique weapon, the only two confirmed users of the Auto 9 are RoboCop himself and RoboCable, who was assigned two pistols as part of an upgrade to the software allowing for secondary targets to be established by the targeting software. Despite being unique to RoboCop and RoboCable, humans were able to utilize the weapon.
The principle designer of the Auto 9 once used the prototype model in an effort to frame RoboCop for murder. Later, a weapons dealer listed an "Auto 9 Avenger" as weapons that he was capable of delivering to his clients which are, presumably, the same as the weapon used by the RoboCop program.
Holster & Magazines
Auto 9 is stored in a mechanical holster which opens out of RoboCop's right thigh with at least one reload magazine as well.
- Armor piercing: an advanced armor piercing round which is be able to penetrate kevlar vests and the titanium armor utilized in the RoboCop program.
- Flechette: a pointed steel projectile, with a vaned tail for stable flight
- High explosive: high-explosive rounds are capable of making a 1inch hole in cold-rolled steel plate ¼ inch thick.
- Non-lethal: a round designed to incapacitate a target rather than kill.
- Seeker: the ammo could lock on to their targets.
- Standard: a standard round.
Behind the scenes
The Auto 9 was built from a Beretta 93R, the select-fire version of the Beretta 92, capable of three-round burst fire, with a custom fore end and compensator. The extended magazine holds 20 rounds. For RoboCop: The Series and RoboCop: Prime Directives, the Auto 9 was shown as being able to carry special ammunition (mainly armor piercing in Prime Directives and Non-Lethal in The Series).
According to the cast & crew interviews in the Criterion Collection DVD, the production team had to fill out extra paperwork to even allow the gun into the United States, because while technically a "pistol", for all intents and purposes it is a high-caliber near-automatic weapon, which comes with extra legal restrictions. Also according to the featurettes, their original plan was to have RoboCop wield an impressive Desert Eagle handgun (which was relatively new at the time). However, while the Desert Eagle looks big in the hands of a normal person, all of RoboCop's extra bulky armor made the Desert Eagle look relatively small in comparison. Therefore, they sought out the modified Beretta 93R.
A similar model was used in the film Sin City by one of the antagonists. Whilst the original Auto 9 used the Beretta 93R as the base weapon, the armourer in Sin City used a Beretta 92FS. You can tell it is a 92FS and not a 93R, by identifying the selector lever above the pistol grip, towards the rear of the gun. The 92FS only has a safety/decocking lever, which is identified by the red dot, while the 93R has a single white dot for semi-automatic, and three white dots in a cluster, for three round burst.
According to actor Peter Weller, the Auto 9, while perfectly balanced was very difficult to spin during RoboCop's trademark gun twirl. Writers considered multiple ideas on where RoboCop kept the ammunition for the Auto 9. Possible ideas included storing extra magazines in his forearms and an unseen interface in his hand which would feed ammo directly into the gun from stores in his arm.