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
Tags: cmmg, barrel, assembly, 223, rem/5.56, nato, 16.1in, nitrided, black, rifle, acc., cmmg55dc70a