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Mfg Item #: 55D660A
Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. - 18 - Medium Taper Profile - 416 Stainless Steel - Bead Blasted Finish - 1:7 Twist - 5.5645 NATO Chamber - Threaded 1/2-28 - Rifle length gas port - .75 Gas Journal