Description
Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly head spaced.
16.1″
M4 Profile
4140 Chrome Moly
Salt Bath Nitride Finish inside and out
1:7 Twist
5.56×45 NATO Chamber
Threaded 1/2-28
Carbine length gas port
.750″ Gas Journal
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