CMMG AR-Barrel 5.56mm 16.1 Light Taper 1:7 Midlength

Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.12.5"Multi Role Profile4140 Chrome MolySalt Bath Nitride Finish inside and out1:7 Twist5.56A-45 NATO ChamberThreaded 1/2-28Carbine length gas port.750" Gas Journal