The CMMG Barrel 5.56 18″ Rifle 416SS is the next barrel you need. Perfect for building your custom AR15 upper group, the Bull profile improves shot to shot consistency during long strings. Every barrel comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. CMMG Barrel 5.56 18″ Rifle 416SS is truly a remarkable piece of equipment.
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