Thanks JB, you are absolutely right. Mixmaster is a term of honor for any issued milsurp rifle in my view. The rear hand guard appears to be the only non matching part and judging from the wear pattern, it has been on the rifle for a good portion of its service life. I would not consider changing it out for the sake of 'correctness'.
+1. Good looking rifle. Here are my mixmasters. Both great shooters.