M4-89 5.56x45 NATO Assembled Upper Receiver - M4-89 5.56x45 NATO 13.7" Bbl 13" M89 Rail W/Nox Brake

Sons of Liberty Gun Works

Resumen

The M4-89 5.56x45 NATO Assembled Upper Receiver from Sons of Liberty Gun Works is a complete upper designed for the AR-15 platform, featuring a 13.7-inch barrel optimized for 5.56 NATO ammunition. With a thread pitch of 1/2x28, it allows for easy attachment of muzzle devices, enhancing performance and customization options. This upper receiver is commonly found in shorter, maneuverable builds that prioritize compactness without sacrificing ballistic effectiveness.