Perfect for building your custom AR15 upper group, the Bull profile improves shot to shot consistancy during long strings. Every barrel comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.
– Caliber: 5.56×45 NATO Chamber – Length: 18? – Profile: Bull – Material: 416SS – Finish: Bead Blasted – Twist: 1:7 – Gas Port: Mid length – .936″ Gas Journal