This AR-15 Complete Upper has a 16" M4 Contour black nitride barrel, it features a 1:8 Twist Rate and a Carbine length gas system. It includes the new 15" MLOK Rail, an M4 flat-top forged upper receiver, a Bolt Carrier Group, a Flash Hider, a rear Charging Handle, and is chambered in 5.56 NATO.
BCG Included
