Clyde Armory has received a shipment of new old stock, out of production, LE6920-R Trooper carbines. See the second image in this post and you will see that these have rollmarked lower receivers.
If you missed out on one for your collection, like I did, now is a chance to get one. You can get one on their website or you can call them at 706-549-1842. Be advised this model of carbine purposely does not come with any sights. You will need to purchase a set off your preferred sights to put on yourself.
I am not affiliated with Clyde Armory, just sharing a good opportunity with you.
Product description from Colts website:
The Colt Trooper® Patrol Carbine is a modernized, pro-quality Modern Sporting Rifle based on Colt’s legendary M4 platform. It features a new Centurion Arms M-LOK® capable free-floated forend developed just for the Trooper®, and offers a great starting point for your next advanced carbine. It’s offered in 5.56 x 45 NATO, and features a 16.1” barrel and a 13” M-LOK® capable Centurion Arms forend with a Picatinny rail at 12 o’clock, and M-LOK® mounting slots at 3, 6, and 9 o’clock. It features a standard M4 buttstock and an A2 pistol grip, and comes with a 30-round Magpul® P-MAG® Magazine.