CMMG Mk4 5.56mm Upper Receiver (CMMG-55B9C21)

CMMG Mk4 5.56mm Upper Receiver (CMMG-55B9C21)


CMMG-55B9C21

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


  • 4150 CMV CL barrel
  • M4 Profile barrel
  • Forged 7075-T6 receiver
  • Black Finish
Caliber 5.56mm
Barrel 14.5", 1:7 twist, M4 profile, 4150 CMV CL, phosphate finish
Muzzle Extended A2 compensator, permanently attached, threaded 1/2-28
Hand Guard M4 type 2 piece hand guards
Receiver Forged 7075-T6 AL M4 type upper
Gas Port Location Carbine


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