This AR-10 Complete Upper has a 22" Black Nitride light-weight barrel, and features a 1:8 Twist Rate, a Rifle length gas system. This upper features our lightweight barrel profile which reduces weight by 1 lb. over traditional contours. It includes the new 15" MLOK Split Rail, an M4 flat-top forged upper receiver, a Bolt Carrier Group, a Flash Hider, and a rear Charging Handle. It is chambered in 6.5 Creedmoor.