I just bought 3 14.5" M4 uppers, and it turns out they are all Diemaco uppers, kind of cool. I paid $1200 shipped for the trio.
Here's some photos:
This is how they all came, just finished cleaning this guy, still working on the other two:
Here's the photos of the forging codes and markings on the receivers:
the carrying handles, the third is mark with A2 as well:
and the BCGs:
Two of the FSPs are marked like this:
and the other like this:
all marked with "F"
All barrels are dated 10/03:
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