Your shopping cart is empty.

  • Menu
  • (0) Cart

CMMG MK3 .308 Complete Upper w/ BCG - Nitrided Stainless 16" Barrel - KeyMod Free Float Handguard

No reviews

You will receive fast, free shipping for all orders over $35

Shipping cost is $5.50 for orders under $35. We ship with UPS and USPS. 

Most orders ship out within 24 hours

You will receive tracking information immediately at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses.  

We have a 90-day no-hassle return policy. We pay return shipping.

If you need to request a return, contact us at and we will send you a return label

After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at We may direct you to pursue your warranty claim directly with the manufacturer.

Your satisfaction is our #1 priority

If you're dissatisfied with your purchase, in any way, please contact us at - we will do our best to make it right.

Product Options


The .308 Mk3 CBR Upper Group features a 16″ nitrided 416 stainless steel medium taper profile barrel in 308 WIN.

The Mk3 CBR is equipped with CMMG’s own SV muzzle brake and RKM15 KeyMod hand guard.


  • Caliber: 308 WIN
  • Barrel: 16.1” 1:10 twist, medium tapered, 416SS, SBN
  • Muzzle: CMMG SV brake, threaded 5/8-24
  • Hand Guard: CMMG RKM15
  • Receivers: 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

Recently Viewed Products