What do you do with a robot armed with a million-round-per-minute gun? "Crowd control," naturally. For several months, Metal Storm, the troubled electronic gun developer, has been working with iRobot -- the makers of military machines and cute, semi-autonomous vacuum cleaners -- to arm some of their new, 250-pound unmanned ground vehicles. Last week, at a defense trade show, the two firms showed off the results of their joint venture.

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