Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly head spaced.
**All NFA rules apply**
Specifications:
- Caliber: .300 BLK
- Barrel Length: 8
- Barrel Twist: 1:7
- Barrel Contour: MT
- Barrel Material: 4140 CM
- Muzzle Thread: 5/8 X 24
- Gas Port Location: Pistol
- Gas Block: 0.750″
- Finish: SBN
- Weight : 1.3 lbs
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