I’ve built up about 10 Colt OEM-2 uppers that were purchased by LE this year and all of them have been excellent. I think only one had an unmarked carrier, barrel markings have been various, all receivers cage code marked.
All of them have been perfect and run perfect. I’ve shot a lot of 6920 along with a few 16” mids lately and I’m totally of the opinion that mid gas is the most overblown, overhyped, overrated, misunderstood aspects of the AR.
Whatever Colt is doing with their barrels and bcgs, just works.