Perfect for building your custom MK3 upper group. Comes with properly installed barrel extension. All barrel sub-assemblies are properly headspaced. ALL NFA RULES APPLY
12.5″;Medium Taper Profile”
4140CM
Salt Bath Nitride Finish Inside and Out
1:10 Twist
308 WIN Chamber (also accepts 7.62×51 NATO)
Threaded 5/8-24
Mid-Length Gas Port
.750 Gas Journal
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