There are a couple of decent sources for the ‘new’ Colt CR6920 on Gun Broker. They are:
https://www.gunbroker.com/item/880784196
The Colt AR-15 Resource
"A site dedicated to the history of the Colt AR-15 rifles, carbines and associated items"
There are a couple of decent sources for the ‘new’ Colt CR6920 on Gun Broker. They are:
https://www.gunbroker.com/item/880784196
The Colt AR-15 Resource 