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Upper receiver with "C" and "H" or "M"
I have 2 colt SP1 uppers, both with the "C" and one with a "H" marking, the other with a "M" mark.
What does the "H" or "M" mark mean? I assume it is a date stamp?
Thanks in advance.
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They are forge marks
H is for Harvey
M is for Martin Marietta
http://www.biggerhammer.net/ar15/uppers/
Last edited by shiva; 01-19-11 at 21:14.
Reason: Added link from info links page
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CM is early 70s and CH is mid 70s to 80s.
Dustin
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