What you are looking at is a Daniel Defense MK18 upper in FDE w/ Daniel Defense Iron Sights/Surefire Warcomp Muzzle Device on a Sig Lower w/ SB Tactical SB3. It also has a Giessele Single stage flat face trigger. This combo has served me well over the past few years and has been one of my favorite range toys. I am looking for $1200. For 250 more I will will throw in a Trijicon RMR for an absolute co-witness setup.