Testing CMMG’s New Guns (8.6 Blackout & Suppressors!)

CMMG Impact at The Outpost Event Introduction

The video opens at CMMG’s Impact at The Outpost event, where Classic Firearms is on site to cover new products on the range. The setting is a dedicated facility CMMG uses to showcase current and upcoming firearms and accessories. The host notes a particular interest in 8.6 Blackout and suppressed platforms, hinting that these will be a focus later in the video. Before heading to the firing line, he meets with Mike from CMMG, who explains that several new and updated models are laid out on multiple tables. Some of the most anticipated items are positioned farther back, setting up a progression from established platforms to newer developments as the range session unfolds.

Mk47 7.62x39 AR-AK Hybrid and Descent Variant

Mike introduces a lineup of CMMG Mk47 rifles, describing the platform as an AR–AK hybrid originally released in late 2014 and now approaching its ten-year mark. The Mk47 was designed around 7.62x39, built to be overbuilt and durable, and crucially to accept standard AK magazines. It uses a traditional direct-impingement system with a buffer tube and is based on CMMG’s midsize .308 bolt carrier architecture. Mike notes that the platform has endured extensive full-auto abuse at events and continues to run reliably. He then highlights the newer Mk47 Descent configuration, which eliminates the buffer tube via CMMG’s compact action, adds side charging for a more AK-like feel, and retains familiar AR controls, including the safety and CMMG’s Zero trigger. The Mk47 family is available in 16-inch rifles as well as pistols, SBRs, and braced pistol-style setups.

Range Impressions with the Mk47 and Delayed Models

On the range, the host shoots the 7.62x39 Mk47 and comments on its controllability. Despite the 7.62x39 chambering, recoil feels mild compared to a typical AK, without the sharp impact often associated with that cartridge. He notes that the AR-style ergonomics and CMMG’s design make the rifle easy to manage, especially during rapid strings. After trying another Mk47-based configuration with a different operating feel, he observes that the delayed system feels softer and more damped, almost featherlight in recoil impulse. Quick double taps remain easy to control, and the rifle seems to encourage fast follow-up shots. Both versions impress him, but the refined delayed model stands out as particularly smooth, while Mike admits a sentimental preference for the original Mk47 that helped establish the platform.

8.6 Blackout Mark 3 Descent and Prototype Suppressor

The focus shifts to 8.6 Blackout, described as a “big brother” to 300 Blackout and noted as being fielded by certain specialized groups. Mike presents a Mark 3 Descent chambered in 8.6 Blackout with a 12.5-inch barrel. Mounted on it is a prototype CMMG 8.6 suppressor that is intended to be compatible with 350 Legend and rated up to .338 Lapua Magnum. The host fires the setup on steel at distance, calling hits and comparing the feel to a BR4 configuration he has shot previously, ultimately preferring the slightly heavier 8.6 package for how it balances and recoils. He emphasizes that 8.6 Blackout delivers serious performance and that CMMG’s implementation in the Mark 3 Descent, combined with the upcoming suppressor, makes for a potent suppressed platform that leaves a strong impression during live fire.

BR3 Descent: Compliant Lower and Trigger Linkage

Mike then introduces the BR3 Descent, built around a new BR-series lower intended to be more compliant in states with restrictive firearm laws. The BR3 lower accepts 870-compatible stocks and will ship with a Magpul SGA stock, allowing users to configure the rifle without traditional AR buffer tubes or standard pistol grips where those are restricted. The BR3 lower is designed to accept any of the .308-size Descent uppers, including .308, 6.5 Creedmoor, and 8.6 Blackout. Mike confirms that BR3 and BR4 lowers will be sold individually, so owners of existing Descent uppers can purchase a compliant lower for travel or residency in restrictive states. He explains that the BR-series uses a non-reciprocating front charging handle that is ambidextrous on the larger frames, and a crossbolt safety that can be reversed for left-handed shooters. Internally, a linkage system connects the Zero drop-in trigger to the BR3’s layout, preserving a crisp, clean break without the mushiness often associated with linked or bullpup-style triggers.

Expanding the Descent Line: 9mm, 300 Blackout, and 5.7

The conversation broadens to the rest of the Descent family. On the table are Descent models in 9mm, 300 Blackout, and 5.7x28. The 5.7 variant uses CMMG’s AR-style conversion magazines, while the 300 Blackout configuration is highlighted in a suppressed setup, aligning with the host’s preference for subsonic, quiet platforms. Mike explains that most Descent uppers, thanks to the compact action, can be mounted on a standard AR lower. When sold as uppers, they include a plate to cap the rear of a conventional lower. He also notes that BR-series lowers, which accept 870-pattern stocks, open the door to unconventional builds such as short 300 Blackout or even 8.6 Blackout configurations with bird’s-head style grips. These combinations are framed as unusual but mechanically compatible extensions of the Descent concept, emphasizing modularity across calibers and lower types.

CMMG Magazines and 30-Caliber Suppressor Overview

Mike details CMMG’s move into dedicated magazines to support its platforms. The company now offers proprietary 5.7x28 magazines, .22 LR magazines, 9mm conversion magazines, and new 5.56 magazines. Earlier 9mm setups relied on inserts in standard PMAGs, but the current 33-round 9mm conversion magazines are purpose-built. Mike argues that for rifles, double-stack, double-feed magazines are preferable to Glock-style single-feed designs, because they provide individual feed lips and more consistent geometry, improving reliability in carbines and PCCs. He recommends CMMG’s conversion magazines for both 9mm and 5.7 applications. The segment closes with a brief look at CMMG’s 30-caliber suppressor, which can mount over A2-style devices and is used on rifles with 14.5-inch barrels pinned and welded to legal length. This suppressor line has been available for several months and is positioned as a factory option for CMMG’s 300 Blackout and other .30-caliber builds.