Does anyone know the origin of this mark stamped on the bottom of the pistol grip of some M1A1icon carbines? (seems like mostly second run) I have been told by some that it stood for "Royal Typewriter" (which I understand did indeed make some metal parts for carbines) and by others that it stood for "Robinson" and the "I" was for Inland. Nobody seems to know for sure, and nobody has suggested what the "3" signifies. I can't find mention of the meaning of this marking in "War Baby", but may have missed it. Any ideas?

Ray
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