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4/28/2009 12:38:01 PM EDT
Does Colt A2 upper have other marking than 'C M'?
4/28/2009 2:22:00 PM EDT
[#1]
Yep, some have C AF

4/28/2009 2:52:59 PM EDT
[#2]
CMB
4/28/2009 2:57:38 PM EDT
[#3]
C AF, C Keyhole, C Keyhole w/ 3 dot inside on mine; I've read some old receiver were marked C H.

4/28/2009 3:10:43 PM EDT
[#4]
It depends on which forge they had the forgings made at.  To my knowledge, Colt has their forgings done specifically for them, so their uppers should all have the "C".  The "M" is for Martin-Marietta, AF is for Alcoa Forge, H is for Harvey Aluminum, K for Kaiser Aluminum...

BiggerHammer has a nice bit on upper forge marks.  And we've discussed this not too long ago, but I can't find that thread to link in here.
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