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CMMG Upper Group, Mk4 T, 300 Blackout 30BC353

CMMG Mk4 T Upper Group, 300 AAC Blackout Stainless Barrel 16" 30BC353


  • $649.95
  • Save $100

The Mk4 T Upper Group introduces CMMG’s RKM series of KeyMod free float hand guards. This particular complete upper, chambered in the popular 300 AAC Blackout, features a stainless steel barrel and standard flat top upper receiver. The free floating Keymod handguard provides excellent accuracy and nearly unlimited modularity. A mil spec bolt carrier group and charging handle are also included, as well as a standard A2 flash hider.

Features and Specifications:

  • Caliber: 300 AAC 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
  • Receiver: Forged 7075-T6 AL M4 type upper
  • Gas Port Location: Carbine


  • Standard AR-15 lower receivers

Manufacturer Number: 30BC353

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