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Randall Gibson goes into great detail in his book Krieghoff Parabellum about the rockwell hardness tests he performed on Krieghoff, DWM,Mauser and Simson frames and toggles among others. The higher the number the harder it is and Krieghoff and Simson were the hardest at 32 and 33. Erfurt and DWM were down to 21 and 22. Quite a difference wouldn't you say? Jerry Burney
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