While helping someone on another firearms forum today I came across an auction on Gunbroker for this LE6940 that was factory anodized FDE. This is 1 of 500 that were made. I have more details and photos in the LE6940 section here.
The Colt AR-15 Resource
"A site dedicated to the history of the Colt AR-15 rifles, carbines and associated items"
The Colt AR-15 Resource 