no set temp its a case by case with various metals etc. the pitting of metal due to excessive heat or hot cold hot again stress cracks or springs collapsing are all tell tale signs a gun part is toast.
a good example would be all of the pkm front trunnions ive seen melt and blow up at knob creek were hungarian and had forge seams where other pkm front trunnions have no forge or cast seams and are billet steel and never melt yet may crack instead.
same item 2 types of metal and both reliable until molten hot yet one cracks and is brittle when the other melts and becomes jello. id say you can get stuff pretty hot and it still works. if theres metal pitting from heat not rust then its usually beyond toast.
Shade tree shop rules say keep it cooler than paper igniting. Put another way, if you touch it with paper will it flame? This is my test for heating bearing cavities and axles etc. paper flames at F455. Stop heating when paper browns. Never let it get hot enough to burn the paper.
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