Brand: CMMG
Model: Dissent
Caliber: 5.56mm
Platform: AR, Mk4
Barrel: 10.5" 4140CM, SBN
Color: Armor Black
Finish: Cerakote
Gas System: Pistol Length Compact Action-Direct Impingement
Muzzle Device: CMMG Zeroed Blast Compensator
Muzzle Thread: 1/2-28
Twist: 1:7
Receiver: Dissent 7075 T6 Aluminum
Handguard: CMMG 9.6" Proprietary
Attachment Style: M-Lok
BCG: Yes
Charging Handle: Dissent Side Charger, Left Side
Receiver Extension: 1913 Picatinny Rail End Cap

Features

DISSENT 10.5" 5.56 Upper Group – Compact Power, Refined

Building on the success of the 6.5", the 10.5" DISSENT 5.56 delivers improved ballistics in a compact, suppressor-ready platform. Designed for AR pistol builders facing a shifting regulatory landscape, DISSENT offers a smart, no-buffer solution.

At its core is CMMG’s patent-pending Compact Action, which houses the entire action and recoil assembly inside the upper receiver—eliminating the need for a buffer tube and reducing overall length and bulk. The forward non-reciprocating side charger ensures quick, intuitive operation without breaking your sight picture.

An adjustable gas block makes tuning for suppressed or unsuppressed use simple, and the included 1913 Picatinny rear plate supports a wide range of brace or stock mounting options.

Whether you're starting a new build or upgrading, the DISSENT 10.5" upper combines modern design, enhanced control, and reliable performance in one sleek package.

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Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.