The Colt Trooper carbines they were moving out a few years ago for less than 8 bills were an absolute steal.
Centurion Arms M-Lock rail on a basic 6920.
I picked it up a few years ago, then sold it here a little bit ago when I needed the money.
I am still shooting my same Colt I bought in the late 90s. The original barrel was getting long in the throat, and was replaced with a super skinny one on a new upper.
Between it and another 6920 that has a 2-8 Leupold with a custom BDC dial for 77 grain MK 262 specifically for that gun's 16" barrel, they meet my needs sufficiently.
I realize neither of my optic are cutting edge these days, but I seem to put rounds into flesh and onto steel, so I will keep them on there for now.
The 6920 has a White Oak Armament barrel and it is amazingly accurate. I have been tempted to put a bigger scope on to take better advantage of its accuracy potential, but it would defeat the lightweight concept of the rifle.
Reference the old Colt A3 with ACOG, as "outdated" as the RDO/ACOG setup is, it is amazingly fast for getting first round hits out to pretty good distances.
* Reference the black vet wrap on the buffer tubes, (someone almost always asks). It keeps my beard and mustache hairs from getting ripped out.