I have owned a bunch of S&W .22 revolvers since buying the first, a .22 Combat Masterpiece in 1967. I have dry fired all of them with never a bit of damage. The S&W revolvers have parts dimensioned and fitted so that the firing pin will not contact the cylinder when fully extended by the hammer blow. If a S&W lvolver shows an impact mark from the firing pin, it should be looked at by a qualified gunsmith to determine the cause because it is not funcning properly.

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Tom
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