Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly head spaced.
CMMG, Barrel, 300 AAC Blackout, 16.1″ Barrel, 1:7 Twist, Carbine 4140 CrMo Salt Bath Nitride Finish, 5/8″-24 TPI
- 1:7 Twist 4140 Chrome moly
- 5/8X24 thread pitch
- Medium taper profile
- Carbine length gas port .750″ gas block Journal
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