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. The barrel is nitrided 4140 CrMo steel barrel in an M4 profile with an A2 compensator and 5/8-24 threads. The M4 buttstock has 6-positions of adjustment and a mil-spec receiver extension. The receiver is made up of a forged 7075-T6 AL M4-type upper with an AR15-type lower. A full-length Picatinny top-rail provides ample space for scopes, sights, or lasers. A2 pistol grip. Single stage mil-spec trigger. 30-round magazine. 1/2-36 threads. 1 in 9" twist.