| 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 |
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Barrel Sub-Assm, 16.1" MT 4140CM SBN, 5.56mm
Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.