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On AR uppers there are forging marks that tell you who made your upper. I got one from PSA that I've never seen. I can find no info on it. It looks like a letter M with a screw (?) going into the middle of the M. I would ask PSA, but that would mean waiting until Hades freezes over. Thanks
 
On AR uppers there are forging marks that tell you who made your upper. I got one from PSA that I've never seen. I can find no info on it. It looks like a letter M with a screw (?) going into the middle of the M. I would ask PSA, but that would mean waiting until Hades freezes over. Thanks
Sure it isn't a diamond above the M , this would be Mueller Industries.
 
bear_creek_arsenal_upper_receiver.jpg

look like this?


That is a possibility. The diamond may just look like the head of a screw. Never having seen a Mueller Industries, it could be.
 

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