New to the AR forum but have been reading for a few days here. Thinking about an AR build and really like reading the how to's on this site. Looks like a great next project. I have found a Colt AR-15A2 Gov't Carbine model (AR6520) for sale and I am hoping to get a good deal on this gun. I am wondering if anyone here has any experience with this particular model. Any information...the good, the bad and the ugly would be much appreciated.