Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart
Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Questions & Answers
7 Models Available
Color
All
Search

Product Info for CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver

For those building on the .308 caliber, the shorter barrel length may not have the long range performance but makes up for it in maneuverability and storage.image

Utilizing patent pending direct impingement Compact Action, DISSENT upper groups house the entire action and recoil assembly in the upper receiver resulting in less bulk and length than traditional ARs. The forward non-reciprocating side charger allows for quick bolt operation without coming off target.

All DISSENT Upper groups include a 1913 Picatinny rail end plate to use in place of the lower receiver buffer tube. Upper groups are available in your choice from seven Cerakote finish options.

Specifications for CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver:

Manufacturer: CMMG
Caliber: .308 Winchester
Barrel Length: 12.5 in
Barrel Twist Rate: 1-10
Threads per Inch: 5/8x24
Muzzle Device: Zeroed Linear Compensator
Finish: Cerakote/Hard Coat Anodize
Gun Type: Rifle
Gun Make: CMMG
Gun Model: CMMG Mk3
Weight: 5.5 lb
Barrel Material: 4140 Chrome Moly Vanadium

Features of CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver

  • Adjustable Gas Block
  • Lifetime Quality Guarantee

Package Contents:

  • CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver

CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver Orderable Models

List of Orderable Models

  • CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver, 1-10 Twist, 5/8 x 24, ZEROED Linear Compensator, Cerakote/Hard Coat Anodized, Coyote Tan, 38B3D0C-CT , MPN: 38B3D0C-CT , UPC: 810148628277 , Code: 2CM-URC-CM11UR-38B3D0C-CT
  • CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver, 1-10 Twist, 5/8 x 24, ZEROED Linear Compensator, Cerakote/Hard Coat Anodized, Sniper Grey, 38B3D0C-SG , MPN: 38B3D0C-SG , UPC: 810148628291 , Code: 2CM-URC-CM11UR-38B3D0C-SG
  • CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver, 1-10 Twist, 5/8 x 24, ZEROED Linear Compensator, Cerakote/Hard Coat Anodized, Midnight Bronze, 38B3D0C-MB , MPN: 38B3D0C-MB , UPC: 810148628284 , Code: 2CM-URC-CM11UR-38B3D0C-MB
  • CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver, 1-10 Twist, 5/8 x 24, ZEROED Linear Compensator, Cerakote/Hard Coat Anodized, Tungsten, 38B3D0C-TNG , MPN: 38B3D0C-TNG , UPC: 810148628314 , Code: 2CM-URC-CM11UR-38B3D0C-TNG
  • CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver, 1-10 Twist, 5/8 x 24, ZEROED Linear Compensator, Cerakote/Hard Coat Anodized, Armor Black, 38B3D0C-AB , MPN: 38B3D0C-AB , UPC: 810148628253 , Code: 2CM-URC-CM11UR-38B3D0C-AB
  • CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver, 1-10 Twist, 5/8 x 24, ZEROED Linear Compensator, Cerakote/Hard Coat Anodized, Charcoal Green, 38B3D0C-CG , MPN: 38B3D0C-CG , UPC: 810148628260 , Code: 2CM-URC-CM11UR-38B3D0C-CG
  • CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver, 1-10 Twist, 5/8 x 24, ZEROED Linear Compensator, Cerakote/Hard Coat Anodized, Titanium, 38B3D0C-TI , MPN: 38B3D0C-TI , UPC: 810148628307 , Code: 2CM-URC-CM11UR-38B3D0C-TI

CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • CMMG Dissent, Mk3, .308 Winchester, 12.5 inch Upper Receiver, 1-10 Twist, 5/8 x 24, ZEROED Linear Compensator, Cerakote/Hard Coat Anodized, 38B3D0C-HCA , MPN: 38B3D0C-HCA , UPC: 810148628321 , Code: 2CM-URC-CM11UR-38B3D0C-HCA
Compare (0)