<img src="/ubbthreads/images/graemlins/smile.gif" alt="" />This is a Rock River upper and lower. The lower is from my National match rifle. I robbed peter to pay Paul on this project of love. I have another lower that needs a parts kit but good luck trying to find one in the current frenzy. I replaced the standard A2 stock with the Magpul ACS stock and DPMS stem. The upper was stripped when I picked it up at Nationals out in Ohio a couple of years ago. I had a heavy bull 1 : 8 twist 5.56 barrel installed about a month ago. The scope is the Nikon P223 BDC. I quickly broke the barrel in about three weeks ago and still fine tuning. The groups at 100 yards are very tight at about ½ moa. <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />