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CMMG Mk3 3GR Upper Group - .308

  • The Mk3 3GR was developed for the heavy metal class 3-Gun shooter, but is just as well suited in the field as it is on the range. The Mk3 3GR Upper Group features an 18″ 416 stainless steel, heavy taper profile, 308 WIN barrel. This Upper Group is equipped with CMMG’s SV muzzle brake and RKM15 KeyMod hand guard.
  • Manufacturer Part Number: 38BCCE5

    Caliber: 308 WIN
    Barrel: 18”, 1:10 twist, heavy taper, 416SS, Bead blasted finish
    Muzzle: CMMG SV Brake, threaded 5/8-24
    Hand Guard: CMMG RKM15
    Upper Rcvr: Billet 6061-T6 AL LR308 type
    Gas Port Location: Rifle

    Upper Group consists of:
         Upper Receiver Assembly (Upper Receiver, Ejection Port Cover)
         Barrel Sub-Assembly
         Hand Guard and Barrel Nut
         Charging Handle
         Bolt Carrier Group

  • The MSR Arms Advisor articles are intended to answer some of the most common shooter questions and assist our customers in making the best purchasing decision possible.
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  • No questions have been submitted regarding this product. If you have a question regarding this, or any of our other products, please submit them by emailing We will return your email promptly and post both the question and answer here for our other customers to view. Remember, there are no dumb questions... Thank you, MSR Arms!

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