While I try not to say anything negative about my beloved Armalite, the 2 grand seems a little stiff for a carbine. I've built a couple different AR-10 carbines for less. Now once again, all of my 10's are the "B" pattern, so I don't pretend to have a lot of working experience with the "A" pattern rifles/carbines. Don't get me wrong, it still looks like a fine weapon. And it may shoot as well (or better) than any of mine. Plus, I don't believe that they offer stripped lowers/uppers from the "A" pattern yet (if that's what you're going for).
And all of this coming from THE Armalite pusher of the forum.