When modularity, affordability, and quality are all important, the Mk4 T is the rifle of choice. The Mk4 T introduces CMMG's RKM series of KeyMod free-float hand guards. It has a 16.1" nitrided 4140 CrMo steel barrel with a medium taper profile and A2 compensator, forged 7075-T6 AL M4 type upper with AR15-type lower, A2 pistol grip, and M4 buttstock with 6-pos mil-spec receiver extension.
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