Ch & cm ??

[1988RRC]

I found this during a search on this site:

"What help I can be:
Colt uppers do, or did have a "CH" or a "CM" molded on the right rear of the carry handle in the thinned web area.

This stands for Colt-Hartford or Colt-Marietta.
This was where the upper was forged, in Hartford or at Marietta, Georgia."

CM = Colt Marietta??? is this correct?
I have never heard of a Marietta company that make colt parts here in Marietta.

[dfariswheel]

As I recall, the raw forging was done by Martin-Marietta, which is a large defense company.
I don't think it was actually done in Marietta Georgia.

[DESERTFOX]

Here is all the info on uppers. You will fined the code and place the upper was forged.
http://www.biggerhammer.net/ar15/uppers/