CMMG Dissent Mk4 .300 Blackout
Model: 30A750A
CMMG Dissent Mk4 .300 Blackout
Model: 30A750A
Full Specifications
Threaded 5/8x24 barrel: compare .30 caliber suppressor prices.
About This Firearm
The CMMG Dissent Mk4 is a folding-stock semi-automatic AR-15 in .300 Blackout built for suppressed shooting and compact storage. It has an MSRP of $2,149.95. Its upper uses CMMG's compact action, which needs no buffer tube behind the receiver, so the stock folds flat against the side of the rifle.
No sights are fitted. The handguard is M-LOK with a Picatinny rail along the top, and two Magpul 30-round PMAGs come in the box. The gas block adjusts, so the rifle can be set for supersonic loads or for subsonic ones behind a suppressor, and the muzzle carries CMMG's ZEROED brake on a 5/8x24 thread. The folding stock adjusts for length of pull and has an adjustable cheek riser, and the safety selector is ambidextrous.
If you're cross-shopping, the Sig Sauer MCX Spear LT has an MSRP of $2,179 and matches this rifle's 6.40 lbs, but it is a 9-inch gun at 27.75 inches overall that has to be registered as a short-barreled rifle, where the Dissent's 16.1-inch barrel and 35.5 inches overall need no paperwork. A used Ruger AR-556 in the same chambering weighs the same again for a fraction of the money, with a fixed gas system and a stock that does not fold. Of the three, only the Dissent both folds down and needs no registration.
Best For
Strengths & Limitations
- CMMG backs every product with a lifetime guarantee against material and workmanship defects.
- The trigger is a CMMG ZEROED drop-in unit, so the fire control is not a mil-spec single stage.
- The barrel is 4140 chrome-moly with a salt bath nitride finish inside and out.
- No sights are fitted anywhere on it, so an optic is a purchase on top of the MSRP.
- The compact action is CMMG's own, so the upper, the carrier and the stock adapter are not standard AR-15 parts.
- The stock's cheek riser and pad are CMMG parts, so a replacement comes from CMMG.
Compatible Ammunition
Find the best prices on compatible .300 Blackout ammunition.
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.300 Blackout Ballistics →Where to Buy
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Frequently Asked Questions
Why does CMMG ship 300 BLK-specific PMAGs?
They are Magpul's 300 BLK pattern, marked so a .300 Blackout magazine is not mistaken for a 5.56 one at the range when both rifles are in the same case.
What does the 60/90 degree selector do?
It can be set to throw either sixty or ninety degrees, so a shooter who wants a short sweep to fire has one, from either side of the receiver.
Is the charging handle ambidextrous?
It sits forward on the handguard and does not reciprocate, so either hand reaches it without coming off the grip.
