The RRA gun will be "fine" but really is not what I would choose. In particular I wouldn't care for the 1:10 twist (not ideal for 6.8 SPC) and the carbine length gas system. It probably will meet the accuracy claim using the best match ammo and 3 or 5 shot groups. If you read up on 6.8 SPC you'll see that 1:10 twist is definitely out of favor.
I really think your best value and accuracy will a complete upper from one of the companies below, then installed onto a complete lower purchased separately. If you buy a complete lower, the "assembly" consists of putting upper onto lower, pushing two push pins and doing a function check. 30 seconds would be generous, and the skill level required is zero. Complete lowers are easy to find and reasonably priced, and many options are available.
http://ar15performance.com/
NOTE: this one also offers complete rifles, one-stop shopping
http://bisonarmory.com/
If you just don't like that route, the Armalite below will probably be better than the RRA in every way but accuracy, and probably not far behind in accuracy:
http://www.armalite.com/ItemForm.as...Category=8e8e5de6-5022-483e-812b-822e58014822
Armalite claims only 2 MOA for this rifle, but that claim is probably based on 10-shot groups (as the military uses) and is not perfectly comparable to the RRA claim. Anyway, if it's that "bad" you're still talking 4" groups at your max hunting range of 200 yards. That's a heart shot on a deer.
A 2-stage trigger has a light first stage followed by a second stage where the trigger "breaks" and shoots. A single stage has only one. USGI triggers are single stage, and vary from OK to awful. Most two-stage triggers have a better, cleaner break, and in general a two-stage is a better choice for hunting, at least at the relatively heavy pull weights used in AR-15s.