To address your speculation butlersrangers, yes I am trying to make this carbine look as spot on and as new as possible.  My carbine and rife projects both started from stripped receivers and proceeded with my scouring the landscape for parts that matched their respective finishes and degrees of wear.  And after all if that I think I developed an eye for what the original finish looked like.

I mentioned at the beginning of this post that I originally put this question up on another forum and that led me to hear.  The forum was the CMP forum and for anyone who's interested here's a link to that post:

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The last comment I got stated that Criterion does not use the correct thread pitch in the rear sight holes.  Has anyone here ran into that problem?