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The signature weapon of the title character of the RoboCop film franchise. The Auto-9 prop was a modified Beretta 93R machine pistol, and it accepts 50-round magazines.
Originally intended to be a modified Desert Eagle (which ended in the film as the sidearm of one of the villains), the Desert Eagle proved to appear too small in the hands of RoboCop, so the director opted to use the bigger looking modified Beretta instead.