Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.
**All NFA rules apply**
Specifications:
- Caliber: .300 BLK
- Barrel Length: 12.5
- Barrel Twist: 1:7
- Barrel Contour: Multi Role
- Barrel Material: 4140CM
- Muzzle Thread: 5/8 X 24
- Gas Port Location: Pistol
- Gas Block: 0.750″
- Finish: SBN
- Weight:Â 2 lbs
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