CMMG BBL 300BLK 16.1" MT 4140CM SBN
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We don’t know when or if this item will be back in stock.Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly head spaced.
- 1:7 Twist 4140 Chrome moly
- 5/8X24 thread pitch
- Medium taper profile
- Carbine length gas port .750" gas block Journal