Hi Norm,
Since it has been restored, I would think the person who restored it did not have that knowledge. That being said, on page 52 of Randal Gibson's book he states, "This component (the magazine release button) is strawed on all of the original contract weapons and those commercial examples derived from this segment of the military range. While strawed examples continue to be noted throughout the remainder of the military and commercial production, the rule is that much darker heat treating prevails. Again purple, blue and black have been observed."
Mike
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