I have a Colt 6920 from the LE161XXX serial number range that I bought as NIB from an individual. This weekend while speaking with a friend who is a lot more knowledgeable than I am on Colt history, specs, etc., he commented on the lack of T-slot markings and a “C” forge mark on the upper next to the keyhole forge mark. I have since had the opportunity to look at several Colt carbines in standard, Socom I and Socom II versions. All of them had the slots numbered along with the “C” forge mark.
Has anyone seen this on any other Colt uppers? I’d like to thank you in advance for your assistance.
Not the Colt expert here but I have heard of no “C” forge marks on Colt receivers but not the lack of T-slot markings. It may mean nothing. Are there any other marks at all next to the forge mark? I recently bought a NIB 6920 from a local gun shop and the receiver extension nut was the “old style”. My research indicates the nut is likely what Colt Canada is using for their ARs. Maybe Colt US was suffering a parts storage…? Others with more experience than I pointed out they have seen Colt do a bunch of inconsistent things with various parts.
Is the barrel stamped with the C MP 5.56 MP NATO 1/7 rollmark?
All of the upper receivers pictured below are genuine Colt receivers and as you can see they do not all have a “C” forge mark. On one receiver there is even a stamped “C” instead of a raised forge mark. As well, some of the pictured receivers do not have T-numbers.
If the barrel markings check out I would not be too concerned. The chances of someone swapping out the factory upper, but keeping the barrel would be rare. Now if the barrel didn’t match up, then it’s possible they swapped the entire upper. Does the BCG markings all check out as well?
