CMMG Mk4 3GR 5.56mm Upper Receiver (CMMG-55B66C7)

CMMG Mk4 3GR 5.56mm Upper Receiver (CMMG-55B66C7)


CMMG-55B66C7

We will price match any currently priced, in stock item. In some rare instances we may not be able to match a price but will do all that we can to give you the best deal possible. (We cannot match the price if it is under our cost) Please call store at 1.800.486.7497 to check availability for immediate pickup. Please review the Terms and Conditions HERE.

Type: AR Uppers


  • Medium weight taper profile barrel
  • Forged 7075-T6 receiver
  • Black Finish
Caliber 5.56mm
Barrel 18"” medium weight taper profile
Muzzle CMMG SV brake, threaded 1/2-28
Hand Guard CMMG RKM14 KeyMod hand guard
Receiver Forged 7075-T6 AL M4 type


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