CMMG DISSENT BR4 .300 AAC Blackout 16.1″ Armor Black

About this product

The CMMG DISSENT BR4 .300 AAC Blackout 16.1" Armor Black is a purpose-built, billet-receiver semi-automatic carbine engineered for precision shooting with a focus on accessory compatibility and regulatory compliance out of the box. This configuration delivers a 16.1-inch 4150 steel barrel with a 1:7 twist rate optimized for stabilizing the full range of .300 Blackout projectiles, avoiding the NFA's Short-Barreled Rifle (SBR) classification while maintaining effective ballistics. It arrives with a Cerakote Armor Black finish, two Magpul 10-round PMAGs, and an adjustable gas block, representing a complete kit requiring zero parts chasing to achieve a functional, suppressor-ready platform.

What is the DISSENT BR4 .300 Blackout used for?

The DISSENT BR4 is primarily designed for the precision shooter who demands a host rifle optimized for subsonic ammunition and suppressors, without immediately navigating SBR paperwork. The 16.1-inch barrel length and 1:7 twist provide ideal stabilization for heavy 200+ grain subsonic rounds while maintaining supersonic capability, making it suitable for hunting medium game, dynamic range training, and sound-suppressed shooting where SBRs are impractical. Its adjustable gas block is critical here, allowing you to tune the system for the drastic pressure differential between 110-grain supersonic and 220-grain subsonic loads, ensuring reliable cycling across a 40% variation in gas port pressure.

How does the DISSENT BR4 compare to the Stevens 334 in .308?

The DISSENT BR4 is objectively superior for rapid follow-up shots, accessory mounting, and suppressor tuning, while a bolt-action like the Stevens 334 Rifle in .308 Win is better for raw long-range precision and simpler ownership. The BR4’s semi-automatic action, full-length Picatinny rail, and M-LOK handguard allow for immediate optic, laser, and light integration that the Stevens 334’s traditional sporter stock cannot match, especially for night-use scenarios. However, for pure mechanical accuracy at distances beyond 400 yards with factory ammunition, the locked-breech design of the Stevens 334 will typically deliver tighter groups, measured in sub-MOA potential versus the DISSENT’s practical 1.5-2 MOA capability with quality ammo.

What does it weigh and what are the dimensions?

Unloaded and without an optic, the DISSENT BR4 weighs approximately 7.8 pounds (3,538 grams), with an overall length of 35.5 inches from the buttstock to the threaded muzzle. The proprietary CMMG M-LOK handguard measures 15 inches in length, providing ample real estate for forward grips and IR devices, while the 7075-T6 aluminum billet receivers add critical mass for recoil mitigation. This weight is distributed effectively, with a center of gravity located just forward of the magazine well, making it manageable for off-hand shooting sessions lasting over an hour, unlike heavier bench-rest rifles.

Who is this NOT for?

This carbine is not for the budget-conscious first-time buyer or someone seeking a traditional wood-and-steel hunting rifle aesthetic, like the Stevens 555 Sporting 20 Gauge. The $1,943.99 price point reflects the billet machining, Cerakote finish, and ambidextrous controls, which are unnecessary expenses for someone who simply needs a basic deer rifle. Furthermore, if your primary use case involves shooting exclusively supersonic .300 Blackout ammunition without a suppressor, a standard 5.56 NATO AR-15 platform would offer cheaper ammo costs and nearly identical external ballistics, rendering the DISSENT’s specialized gas-tuning capability redundant.

What's in the box?

You receive the complete rifle, two 10-round Magpul PMAGs specifically blocked for .300 Blackout, the reversible side-charging handle installed, and all necessary paperwork; no tools or bore-snake are included. The Magpul SGA synthetic stock is pre-installed, and the muzzle is capped with a standard A2 flash hider threaded 5/8x24, ready for direct suppressor attachment or a muzzle device swap using a 19mm crowfoot wrench. CMMG ships it in a standard cardboard box with foam inserts, not a hard case, so factor in an additional $80-$150 for a Plano or Pelican case for serious transport.

Is the DISSENT BR4 worth it at $1,943.99?

Yes, the DISSENT BR4 justifies its price if your use case explicitly involves suppressed shooting, cartridge versatility, and a desire for a “no-gunsmithing” premium AR platform. The combined value of the billet BR4 lower, Cerakote finish, adjustable gas block, and side-charging upper would cost over $500 in parts and gunsmith labor if assembled piecemeal, not accounting for the warranty covering the complete firearm. For a shooter who intends to use this as a dedicated suppressed host and values the out-of-the-box compliance of a 16.1-inch barrel, this price represents a logical entry point into the high-performance .300 Blackout ecosystem, avoiding the common pitfalls of under-gassed or poorly configured home builds.