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Old February 8, 2013, 10:50 AM   #19
Senior Member
Join Date: June 18, 2009
Location: NorthWest USA
Posts: 1,996
Nice list, Slappy! Where'd you find it. I've seen older versions but not that.

To add, my Daniel Defense, BCM and PSA uppers all have the square mark indicating Brass Aluminum forge. I have seen other examples of the three that are Cerro - keyhole.
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