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Old August 22, 2012, 02:23 AM   #6
Senior Member
Join Date: July 15, 2012
Location: Wonderful, Windy Wyoming
Posts: 133
It's on the DOD engineering drawings for the parts of the weapon. In this case, look for drawing 7790185. You can find drawing numbers in the back of TM 9-1005-223-34.

You can also find reference to the heat treatment protocol in a book on the M14:
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