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11/5/2011 7:50:30 PM EDT
My BCM Upper Receiver - M4 Flat Top - DEMO/Scratched. Only had scrathes on the top. But a Square Forge mark. Who Done the Forge.
11/5/2011 7:55:27 PM EDT
[#1]
I'm prety sure it's Brass Aluminum Forging, but may be incorrect.
11/6/2011 4:41:41 AM EDT
[#3]
My new RRA complete upper has the same square forge mark on it too and yes it's a Brass Aluminum mark.  They make uppers & lowers + components for several other AR people too.
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