Barrel Sub Assembly

Perfect for building your custom AR15 upper group – Comes with properly installed M4 barrel extension – All barrel sub-assemblies are properly headspaced

Description:

• Caliber    5.56x45mm
• Barrel Length    16.1
• Barrel Twist    1:7
• Barrel Contour    MT
• Barrel Twist    1:7
• Muzzle Thread    1/2 X 28
• Gas Port Location    Mid
• Gas Block    0.750
• Weight    1.56 lbs