disclaimer: I'm not a gun expert, which is why I'm here. When I get back from my current deployment, I would like to buy an assembled AR15 in 6.8mm caliber with a quad rail and a tactical stock. I've been told that Rock River Arms puts out a good quality AR15, but I don't want to spend the ~$1000 they want for that configuration. I'm not a budding gunsmith and don't want to assemble it from parts, although I know that would probably be the cheapest route available. Any suggestions?