I have a YHM complete upper I need to get rid of. It is 16" fluted 1/7 twist barrel with carbine gas system. The upper, BCG and Tactical Charging Handle are all YHM too. Flip up rear iron sight and flip up front sight/gas block also all YHM. Installed is the YHM Phantom Flash hider. The only thing not YHM is the Hogue free float hand guard. In all, there is over $850 in parts and gunsmith cost here. I had a smith head space and torque the barrel to insure proper installation. Roughly 200 rounds down the pipe.