If this is the wrong place to ask please let me know.

I recently purchased a used C7 type upper lacking the R near the rear sight. Someone told me this means it was a real made for Canada upper as the R doesn't translate to French??  No Diemaco stylized Forge code just the Splintered A, and no M4 feed ramps.

Any significance to this claim of real deal Canadian based on the (lack of)rear sight "R" marking??

I have never heard of a, "no R" upper.  But the Anchor Harvey forge code makes it look like all the other commercial C7 uppers sold in the last 5 years.  There was an entire C7/C8 thread in the A2 forum that 2 Canadian military gentlemen had a lot of good information included.

ETA: Found the link in the Archives.  Bummer. I loved this thread.  
C7 Thread

The "No R" being Canadian Mil origin gets repeated in the C7 thread, but this looks commercial to me also.
Thanks

Commercial upper.

AFAIK all Canadian issued C7 uppers are either Colt CH marked or have a Devtek with various forge codes.  I've seen one variation that had a C and a Devtek, wish I had a picture of that one, iirc it had a Christmas tree style forge code.  Normally on a Colt you tell that the R was removed with an end mill.  All the Devtek marked uppers never had the R on the forging AFAIK.  

I'm sure Rebel Rouser will be along soon with his .02 cents.  He really seems to know a lot about some of the finer details.

I'd say it's commercial but cool nonetheless.

What Leg said ^^^^^^^^^^^^^^^^^^ BTW, "R" in French is short for "Reverse" so the R was deleted to avoid confusions for the French speaking Canadian Forces.