Product Overview
Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly head spaced.
Features :
Features :
- 1:7 Twist 4140 Chrome moly
- 5/8X24 thread pitch
- Multi Role profile
- ,Carbine length gas port .750" gas block Journal, 300 Blackout chamber,
