if it was a simple matter of just reheating the receivers and letting them cool slowly then the defense dept would have done that, several other nations and companies used the same methods of making their rifles only they used thermometers so they wouldn't over cook the metal, none of those are considered unsafe to fire. depending on weather conditions and the time of day that springfields were treated there is virtually no difference between the steel in a mauser, the steel in an enfield and the steel in a springfield.
all guns lost in a tragic smelting accident.
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