I think the Colt Expanse lower is indicated with the serial number starting with "CE"? Other differences I read about are the .223 on the side instead of 5.56. Also, I've seen that the Colt Expanse lower with Colt's MFG instead of Colt Defence.
Not a huge deal by any stretch, but I bet it would be a deal breaker for some collectors.
I'd probably buy one if I didn't just piece together an LE6920
LE6920's also have chrome lined barrels where the Expanse does not.


















































