The 442 is “hammerless,” meaning the hammer is actually enclosed within the frame—so it can’t get ... though .357 is not usable-—and does not physically fit—in .38 Special revolvers.

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Apparently, there is enough interest in the hammerless revolver concept that Taurus makes the CIA (Carry It Anywhere), a S&W Centennial look-a-like. They also have the 605 Polymer.