Re: Lets build me an AR15
Don't know what your budget is, but for 1100-1200 you can build a very nice AR... I just built one (keep in mind that you don't need to have certain things like the Magpul UBR stock which added $200). you can build it yourself, its not hard... i learned from watching youtube online and reading online (
http://www.midwayusa.com/Static/ar-15VarmintRifleInstructions.aspx was a great resource).
The AR I just build has the following: daniel defense upper ($115), daniel defense cold hammer forged barrel (top of the line - $250), Adams Arms piston conversion system ($280 or so, there is controversy over this, but is known to make system run cleaner, cooler, and smoother: includes gas block, gas tube, hand guards, bolt carrier group <minus bolt, cam pin, firing pin, and retaining pin>) featuring a lewis machine and tool bolt ($60), Magpul flip up sights (~$90, nice if you want to use optics with iron sights, but don't know how well they would work at 500 yards, you cannot adjust rear sight to compensate for distance), Aero precision mil-spec lower (can get one without stock for $130 prior to ffl fee, figure on another $50-60 for a basic stock), Magpul UBR stock (~$200), dark earth hogue grip to match stock ($20). The only other things you would need to add to this order would be a charging handle (~$20), flash hider (~10), bolt parts (cam pin etc. ~$15), one point sling (would recommend condor as it is very comfortable and good price - $30).
If you want a quad rail, it seems to me that troy industries makes good quality ones for a great price. The piston system will only cost a total of about $100 more if you are building it from scratch. check out the article above to see what you will need to build it... basically all you need other than some basic tools is a vice, a vice block ($40) and a take down wrench ($20-40), but then you can build all the AR's you want! =) hope I helped!
ps. some of the best prices I have found have been at
www.westernsportonline.com, where Justin will hook you up (I got everything except lower from him), and
https://eagleeyebigsky.com which is where I got my lower from... great price and Jason was great to work with!