I don't know for sure if the metal of these two parts is different from the rest of the gun, but they are definitely heat treated differently since they are both "springs".
I think the surface hardness of these spring parts is what causes them to "take" the blue solution differently than the rest of the pistol.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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