Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. Made of 416 Stainless with an SBN Finish.
Specifications and Features:
- Platform: MK4
- Caliber: 5.56mm NATO
- Barrel Length: 18″
- Barrel Twist: 1:7″
- Barrel Contour: Medium Taper
- Barrel Material: 416 Stainless Steel
- Muzzle Thread: 1/2×28″
- Finish: Salt Bath Nitride
- Weight: 1.8 lbs
- Gas Length: Rifle
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