Perfect for building your custom AR15 upper group, the Bull profile improves shot to shot consistency during long strings. Every barrel comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.
Specifications :
- Length: 16.1?
- Profile: Bull
- Material: 4140 Chrome Moly
- Finish: Salt Bath Nitride Finish inside and out
- Twist: 1:7
- Caliber: 5.56×45 NATO Chamber
- Gas Port: Mid length
- .936? Gas Journal
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