Originally Posted By cthorton:
Because maybe they were in the anodizing tank too long.
Look, I have about 50 post sample 2003-2004 Colt M4s sitting in front of me that have the exact same forging with white T marks and dry lube. They have the same ugly C keyhole marking. Even the font style on the T marks is the same.
The T mark font style should have been an immediate clue these were genuine. Like you said. You are very familiar with colt uppers.
I also have two engineering degrees and one in metalugry. People in this tread have no clue between cast and forged.
Not one of you has attempted to maybe contact an actual expert like Ken Elmore to weigh in on this. Instead you take the word of Colt dealers who are actually second hand resellers.
I have seen Colt and non Colt uppers with matching and non matching fonts, as well as many different fonts between different Colt uppers, and even no font at all. Same with the M4 marking. So, the font isn't a dead giveaway, but I'll admit it could be a clue depending on how you're viewing this situation.
As far as their brittleness, it seems they would be more likely to crumble versus pop off in perfect form if your theory is correct, but who knows. It also doesn't help that these were claimed to be 100% in spec, etc., yet they don't match the typical Colt specs all the way around, and at a minimum are unfinished, cosmetic blems.
I can see why people had questions about these uppers. Everything about them was off. The raised C isn't even current, yet there's suddenly a massive batch of unfinished, cosmetic blem, vaguely marketed, inexpensive, available from relatively little known vendors, Colt uppers. Then add in the fact that other issues started to arise after more owners started digging in (literally), it only makes sense to question what they have.
What I don't understand is if you're such an uber engineering/metallurgical mastermind, why didn't you explain the issue as you see it from the beginning instead of coming into the thread and posting useless sarcastic replies? You really offered nothing of substance until now.