Quote Originally Posted by scottryan View Post
That upper has been modified by an aftermarket party. It is too old to be relevant to any other discussion in this thread.

Colt only did non-anodized feedramps during 1999-2000ish on some 6520s.
Can you explain further?
I should note that the feed ramps appear to be anodized, and I think what you're seeing is a reflection.