Bob,
Not sure if my reply got posted, so will try again. Front Sight has a very small "R" just behind the sight blade. I don't see any markings at all in the sling well. It has the cutout for an M@ selector switch. Safety lever has an "N" on the bottom, but partially obscured. There is a hand stamped "1" at the front of the receiver just after the "30 M" . Mag catch has "HI" or "IH". Rear sight has "I.R.C.O." but I don't see any other marking. Front band has "AI".
Jim