Sleek, its lines rakishly tilted to boost the ergonomics that index grip placement to barrel, this automatic pistol has but one function: to eliminate human beings easily. That sinister intent is expressed most eloquently in the extended magazine that reaches far beneath the pistol grip, easily tripling the amount of ammunition available to the killer. It's the Colt Super .38 automatic pistol, customized into a machine pistol by an underworld gunsmith so that Babyface Nelson could use it to kill an FBI agent outside Little Bohemia, Wis., in 1934. Maybe you saw the movie. Even if you didn't, you can...