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Big bore performance in a package you can maneuver through a treestand or truck cab, that is the whole idea behind the CMMG DISSENT Mk3 in 8.6 Blackout. Think of 8.6 BLK as the 300 Blackout concept scaled up to .338 caliber. It was designed from the ground up to run heavy subsonic loads out of short barrels, and the 12.5-inch 4140CM barrel here wears an aggressive 1:3 twist that keeps those big projectiles stable and spinning fast enough to do serious work downrange. Add a suppressor to the 5/8×24 threads and you have a quiet, thumping hog and deer setup that hits well above its size.
Unlike a standard AR, the DISSENT uses CMMG's compact direct impingement action with a side charging handle, which means no buffer tube hanging off the back. That is how this pistol pairs with the SB Tactical FS1913A aluminum folding brace and folds down to a genuinely stowable footprint. The charging handle is reversible for lefties, the ambidextrous ZEROED safety works at either 60 or 90 degrees, and the ZEROED drop-in single stage trigger breaks clean right out of the box. Both receivers are machined from billet 7075-T6 aluminum, and the 11-inch handguard gives you plenty of real estate for lights, a bipod, or a laser.
The adjustable gas block is the detail suppressor owners will appreciate most. Whether you are running heavy subsonics through a can or supersonic hunting loads unsuppressed, you can dial the gas exactly where it needs to be instead of living with an overgassed gun. The ZEROED linear compensator sends blast forward when shooting unsuppressed, and the black nitride barrel finish shrugs off wear and weather. With two 20-round Magpul PMAGs in the box and CMMG's lifetime guarantee behind it, this DISSENT Mk3 is ready to earn its keep from the first range trip.
8.6 Blackout is essentially the big brother to 300 Blackout, built around .338 caliber bullets and designed to perform from short barrels. The extremely fast 1:3 twist spins heavy subsonic projectiles hard enough to stabilize them and improve terminal performance. It is a cartridge purpose-built for suppressed shooting and short-range hunting on hogs and deer-sized game.
Yes, this version ships with an SB Tactical FS1913A aluminum folding brace attached. Because the DISSENT uses a compact action with no buffer tube, the brace folds flat against the receiver for a very short stored length. CMMG also offers a bare version with a 1913 Picatinny rear plate if you prefer to run your own setup.
Very much so. The 12.5-inch barrel is threaded 5/8×24 behind the included ZEROED linear compensator, and the adjustable gas block lets you tune the gas system for suppressed subsonic loads or unsuppressed supersonics. That tunability is a big reason this platform pairs so well with a .338 caliber can.
It runs standard AR10/SR-25 pattern magazines, and CMMG includes two 20-round Magpul PMAGs in the box. Since 8.6 Blackout is based on a shortened .308 case, feeding from common large-frame AR mags is reliable and replacement mags are easy to find.
| UPC | 810148629809 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 33A380C-AB |
| Action | |
| Barrel Finish | Black Nitride |
| Barrel Length | 20 + 1 |
| Caliber/Gauge | 8.6 Blackout |
| Capacity | Zeroed Single Stage |
| Safety | CMMG Zeroed 60/90 Degree |
| Sights | 7.30 lbs |
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