Unstamped AR A2 Upper Receiver?

interesting.....maybe either bm,rra, or a generic model 1 sales upper.

without any markings its pretty impossible im afraid, even with a forging mark you still dont know where it went after than conclusively
 
Need to post a pic. Some of the eary Colt M16 rifles had no forge marks in the same area as uppers do today.

The early A1 M16 uppers had their marks in the area above the front pivot lug if I remember correctly. I had sever of these years ago. Sometimes they are faint marks.
 
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