CMMG - DISSENT Mk4 300BLK 10.5"

Published on February 19, 2026
Duration: 10:57

This review provides an expert-level assessment of the CMMG DISSENT Mk4 300BLK pistol. The experienced instructor highlights its compact design, innovative internal buffer system allowing for a folded brace, and modularity with accessories like Holosun optics and CMMG Zeroed suppressors. The review details the firearm's performance with various ammunition, the functionality of its adjustable gas block, and the quality of its fit and finish, concluding it's a well-balanced and nimble platform.

Quick Summary

The CMMG DISSENT Mk4 300BLK features a 10.5" barrel in 300 Blackout, an internal buffer system enabling firing with a folded brace, and an adjustable gas block for suppressed use. Its non-reciprocating charging handle and M-LOK rail enhance ergonomics and modularity, making it a highly maneuverable and reliable firearm.

Chapters

  1. 01:46Introduction to CMMG Dissent
  2. 02:11Dissent: 300 Blackout, 10.5" barrel
  3. 02:51Barrel, Adjustable Gas Block, Suppressor
  4. 03:40Zeroed Suppressor
  5. 04:10Rail System Features
  6. 05:20Upper Receiver Features
  7. 05:53Fit & Finish
  8. 06:18Lower Receiver Overview
  9. 07:33Trigger and additional features
  10. 08:15Strike Industries Brace
  11. 08:34Function, Reliability, and Philosophy

Frequently Asked Questions

What are the key features of the CMMG DISSENT Mk4 300BLK?

The CMMG DISSENT Mk4 300BLK features a 10.5" barrel chambered in 300 Blackout, an internal buffer system allowing for a folded brace, an adjustable gas block, a non-reciprocating charging handle, and M-LOK compatible rail system.

How does the CMMG DISSENT Mk4 300BLK perform with a suppressor?

The CMMG DISSENT Mk4 300BLK is designed to run reliably suppressed, thanks to its adjustable gas block which allows users to tune the gas system for optimal performance with various ammunition types and suppressor configurations.

What makes the CMMG DISSENT Mk4 300BLK suitable for compact use?

Its compact design is enhanced by an internal buffer system that permits firing while the brace is folded, making it exceptionally maneuverable for close-quarters applications and easy storage or transport.

What are the available caliber and configuration options for the CMMG Dissent series?

The Dissent series offers a variety of options, including 300 Blackout with a 10.5" barrel, shorter 9mm versions, and slightly longer 7.62x39mm variants, providing a range of choices to suit different user needs and preferences.

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