This is a CMMG Barrel chambered in 300 Blackout, model 30D120A.
Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly head spaced.
Features:
1:7 Twist 4140 Chrome moly
5/8X24 thread pitch
Medium taper profile
Carbine length gas port .750 gas block Journal
