Z-Michigan
Member
After Colt, there is everyone else and if you want to go upmarket, start with the Colt. It will set the benchmark for you as far as reliability and value retention.
I think this is going too far in praising Colt. Sure, their 6920 is a good carbine (it should be since it's basically a semiauto 16" M4). But there are other makes that are just as good and even better, and some of them don't cost any more. I would take the DD carbine I linked above over a 6920 without a second thought. Colt might (might!) hold more resale value, but if that's a major consideration don't buy any of these rifles, just keep the money... or at least buy something truly collectible.