CMMG MK4 T 30AC322 30AC322- In Store Item


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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. Either a 416 stainless or nitrided 4140 CrMo steel barrel in a medium taper profile are offered for both 5.56mm and 300 BLK. The 22LR and 9mm models feature a nitrided 4140 CrMo M4 profile barrel.


  • Caliber: 300 Blackout
  • Barrel: 16.1″, 1:7 twist, medium taper, 416SS, bead blasted finish
  • Muzzle: A2 comp., threaded 5/8-24
  • Hand Guard: CMMG RKM11 KeyMod hand guard
  • Furniture: A2 pistol grip, M4 butt stock with 6-pos mil-spec receiver extension
  • Receiver: Forged 7075-T6 AL M4 type upper, AR15 type lower
  • Trigger: Single stage mil-spec style trigger
  • Weight: 6.3 lbs (unloaded)
  • Length: 32″ (stock collapsed)
  • Gas Port Location: Carbine