CMC Triggers AR-15 Barrel 556 NATO 17 Twist Carbine Length Gas System 10.5 Long Government Profile Threaded 1/2x28 Nitride Finish Black. 56 NATO ammo. With a Carbine length gas system" M4 feed ramps for reliability" a 1:7" twist rate" 1/2"x28 thread...
CMC Triggers AR-15 Barrel 556 NATO 17 Twist Carbine Length Gas System 10.5 Long Government Profile Threaded 1/2x28 Nitride Finish Black. 56 NATO ammo. With a Carbine length gas system" M4 feed ramps for reliability" a 1:7" twist rate" 1/2"x28 thread...