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Discussion Starter · #1 · (Edited)
I just saw one of the G3 flats that someone just got in from ORF direct. There is an 'S' stamped on the rear bottom by the buttstock pin area. I don't remember if the 1st batch of flats were stamped with any markings. Does anyone know?

It also seems this later flat has a more oval slot for the A3 stock rails vs the round slot on the first flats. Still not square though like a factory receiver.
 

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Not sure, but maybe he's doing that to distinguish them from his first run?
 
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