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The concerns about cast iron recievers and frames are often based on the misconception that simple "grey" cast iron was used.
In some cases that would be true, but reputable gunmakers made a point of using various grades of "White Cast Iron" AKA "Malleable Cast Iron" which has tremendous compressive strength.
White cast iron is almost pure iron with little to none of the impurities that cause fracturing of grey iron.
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