New to AR's and know next to nothing about them. I picked up this Colt LEO carbine a while back. All other Colts I have seen have a "C" rather than the markings on this upper receiver. I figure a) Colt was getting parts from other sources and it left the factory this way or b) dealer swapped parts/fucked me over ..  Hopefully I have what I was told I was buying. Thanks in advance for the help.
http://www.hunt101.com/watermark.php?file=500/23614a3-med.jpg

Diamaco. It is a Colt upper receiver. I believe Colt owns Diamaco and many of the new Colts are coming marked this way.

+1

I have the same Diemaco Anchor Harvey forging markings on my Colt M4 upper that I bought last April.

Here's a reference thread, scroll down to UPPER RECEIVER MARKINGS.

www.ar15.com/forums/topic.html?b=3&f=118&t=223495

Thanks very much! I'll sleep better tonight