Thanks for the info. I am going with a complete upper though. I am going to be using for target shooting as well as hunting so I did not want to go trouncing through the woods with a 24" barrel, would have prefered 20" but DPMS only offers their upper with an 18" barrel and figured that would still make for a rifle that can shoot better than me. I'd planned on ordering directly from DPMS this weekend, but I found one on GB that was actually more than I'd planned on getting from DPMS for a couple hundred less than they were going to charge me. I'm guessing the rail height will not be an issue as I am installing a scope only and no iron sights (upper I purchased has a smooth gas block anyway). http://www.gunbroker.com/Auction/ViewItem.aspx?Item=271041742 Have also purchased a few items to mod out the lower and finish the rifle how I want. I am left handed so Norgon ambi mag release and ambi safety A2 buffer tube, spring, and buffer to go with ARFX skeleton stock Oversized takedown pins Timney trigger for 308 single stage 4lb Mags (2) 20rd P-mags and (1) DPMS 10 round Harris Bi-pod TacOps charging handle Luepold scope mount/riser, for the time being I have a 50mm Bushnell scope that has been sitting in the safe that I'll use (picked it up a couple years ago for a $ I couldn't pass up and haven't had anything to put it on) I think I've got everything but ammo (and of course the upper but it's paid for now and will be on it's way soon). I'll update with pics as I start to put it together, maybe throw a couple pics of my other black guns out there if anyone is interested (have .223/5.56, 6.8spc and a M&P 15-22). Thanks again to everyone, this forum has been very helpful and informative.