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USGI will have part number and makers stamp on web of op-rod.
7267064 TRW, 7267064 HRA, 7267064 SA,
7267064
61188
7267064
MFR 24411
USGI SA op-rod will have part number followed by SA all on one line, SAI op-rod will have part number with SA below it(2 lines).
Chinese not marked at all.

PS 61188 is cage code for Winchester, 24411 is Mercury Tool & DIE.
 

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Quick / Rough answer ...
GI op rods will have the notch/hook at the front to pull on the go fast parts,
and MOST civillian op rod copies, meant for semi auto only rifles,
will NOT have such a notch.

After that quick/rough check,
... what TNW50Cal said.
 
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