Description

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