Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.
Heavy Taper Profile
4140 Chrome Moly
Salt Bath Nitride Finish inside and out
5.56×45 NATO Chamber
Threaded 1/2-28 w/ Thread Protector
Midlength gas port
.750″ Gas Journal