I went to the range today with my new Colt 6721. WHAT A GREAT RIFLE. I had a lot of fun and it is very accurate. I highly recommend it to anybody who is in the market for a great AR.
I have the same rifle and love it. Trigger felt good but could be a little smoother on mine. I used a vortex strikeforce optic on mine and was pretty accurate.
Definitely agree with that. Within that price range you can't do better in this state than a Colt 6721 rifle as far as durability and all that. Bonus: lots of fun to shoot and low recoil even by AR standards because of the HBAR.