Symbol behind case deflector on AR upper?

flyrodder

New member
What do the symbols indicate 3/4" to the rear of the case deflector on the right side of the AR upper. I have a square on one and a keyhole on the other one.
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Thanks, Flyrodder
 
It is a forging mark from the company the produced the raw forging. There are several different ones out there, and countless different companies machine them into upper receivers.
 
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