Brand: CMMG
Model: Dissent
Caliber: 300 Blackout
Platform: Mk4
Barrel: 10.5" 4140CM, SBN
Color: Armor Black
Finish: Cerakote
Gas System: Pistol Length, Adjustable
Muzzle Device: Zeroed Linear Compensator
Muzzle Thread: 5/8-28
Twist: 1:7
Receiver: Dissent 7075 T6 Aluminum
Handguard: CCMG 9.6" Proprietary
Attachment Style: M-Lok
BCG: Yes
Charging Handle: Dissent Side Charger, Left Side

Features

You loved the 6.5" DISSENT in .300 Blackout—so we took everything great about it and turned it up a notch. The new 10.5” DISSENT Upper delivers improved ballistics and an even more suppressor-friendly length, making it the perfect upgrade to complete your .300 BLK AR pistol build.

With ongoing scrutiny around pistol stabilizing braces, AR pistol builders have been left with questions—DISSENT is our answer. Featuring CMMG’s patent-pending Compact Action, the entire recoil system is self-contained within the upper receiver, eliminating the need for a traditional buffer tube and reducing overall bulk. The forward, non-reciprocating side charger allows fast, intuitive operation without breaking your sight picture.

Each upper includes a 1913 Picatinny rear rail plate, perfect for mounting stocks or braces (where legal), and comes equipped with an adjustable gas block—giving you the flexibility to tune your setup for either supersonic or subsonic loads, especially when suppressed.

Suppressed or unsuppressed, short or long—the DISSENT 10.5” .300 BLK Upper delivers adaptability and 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.