Product Description
Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.
- 16.1?
 - Medium Taper Profile
 - 4140 Chrome Moly
 - Salt Bath Nitride Finish inside and out
 - 1:7 Twist
 - 5.56�45 NATO Chamber
 - Threaded 1/2-28
 - Midlength gas port
 - .750? Gas Journal