The video covers the CMMG Dissent chambered in the new 8.6 Blackout cartridge with a 12.5-inch barrel. The host explains that 8.6 Blackout uses a .338 Lapua projectile in a shorter casing, giving a large, heavy bullet in a more compact package. The Dissent platform is roughly the size and weight of a typical AR, offering a smaller and lighter alternative to larger precision rifles like the Barrett MRAD for launching this projectile. The featured configuration ships with 20-round Magpul magazines and is positioned as a compact, AR-style firearm built around this emerging caliber.
Attention shifts to the front end of the CMMG Dissent. It features a muzzle brake and a 12.5-inch barrel, with mention that an 8-inch barrel version is expected and still delivers useful velocity with the large 8.6 Blackout projectile. The barrel has a very fast 1:3 twist rate to stabilize the heavy bullets. A full-length Picatinny rail runs along the top, allowing mounting of a red dot with magnifier or a full scope for shooting out to roughly 500 yards or more. Unlike standard AR-15 or AR-10 platforms, the Dissent has no external buffer tube; the recoil system is contained within the upper receiver area, changing how the firearm is cleaned and maintained.
The Dissent uses a direct impingement gas system, with the gas tube visible inside the handguard. It has a side charging handle mounted on the left that can be reversed to the right, giving flexibility for left- or right-handed shooters. The rifle includes ambidextrous magazine releases on both sides of the lower receiver, while the bolt release remains on one side and requires some dedicated muscle memory. An ambidextrous safety selector is also present, with a chevron-style textured surface that is easy to manipulate with either the thumb or index finger. The pistol grip has moderate texturing on all sides, a comfortable grip angle, and a hinged bottom compartment suitable for small items such as lubricant, with an insert to reduce rattling.
At the rear, the Dissent has a 1.93-inch Picatinny rail section, allowing the user to attach a stock on an SBR configuration or a brace when kept as a pistol, depending on how the firearm is registered. Because 8.6 Blackout is a relatively new cartridge and often used with suppressors, the rifle includes an adjustable gas block on most, if not all, CMMG Dissent models. This lets the shooter tune the gas system for different ammunition types, suppressed or unsuppressed use, and various muzzle devices, including the factory brake or other options. The adjustability is intended to help manage recoil and reliability across different setups.
The host demonstrates the trigger after confirming the firearm is clear. The trigger has very little take-up, breaking sooner than expected with an estimated pull weight around 3 pounds. The reset is audible and tactile, with only minimal movement between reset and the next shot. The lack of excess travel and the crisp break are emphasized as beneficial for fast, controlled shooting. This trigger behavior, combined with the 8.6 Blackout chambering, is presented as allowing quick follow-up shots and efficient use of the heavy projectiles downrange while maintaining good control over the firearm.
The video concludes with a recap of the CMMG Dissent’s specifications. This particular model is chambered in 8.6 Blackout with a 12.5-inch barrel featuring a 1:3 twist rate and a nitride finish. The muzzle threads are 5/8x24, and the firearm is shown in a pistol configuration, with other configurations available. The upper is a CMMG Mk3 Dissent upper made from 7075-T6 aluminum, paired with an 11-inch proprietary aluminum handguard. The charging handle is reversible, and the drop-in trigger and pistol grip can be swapped for user-preferred components. Overall length is about 23 inches, and weight is approximately 7.3 pounds. The package includes two magazines in the box, and viewers are encouraged to share their experiences with the CMMG Dissent and the 8.6 Blackout cartridge.
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