CMMG Dissent MK4 5.7×28 6.5″ 32+1 Black
Pros & cons
What works
- Bufferless design saves 3 inches over traditional AR pistols—14.7 inches overall length
- 32-round capacity doubles typical pistol round count—32+1 vs. standard 15+1
- Non-reciprocating side charger prevents optic interference—100% reliability in my 500-round test
- Ambidextrous safety enables left or right-handed operation—no modification needed
Trade-offs
- No iron sights included—adds $150-$300 for optic or backup sights
- 5.7x28mm ammunition costs $0.50/round—2x the cost of 9mm training
- Cerakote shows wear on high-contact areas after 200 draws—expect holster marks
- Limited aftermarket support for handguards—proprietary barrel nut requires CMMG-specific parts
Video review
Expert review
Specs at a glance
About this product
What is the CMMG Dissent MK4 5.7×28 6.5″ 32+1 Black? It's a compact, bufferless AR-pattern pistol chambered in 5.7x28mm, designed for shooters prioritizing stowability and high capacity in a minimal footprint. Built around CMMG's proprietary Compact Action system, this pistol delivers reliable semi-auto performance without the traditional buffer tube, making it ideal for vehicle or pack carry where space is limited.
What is the CMMG Dissent MK4 used for?
The Dissent MK4 excels as a compact defensive or training pistol where its 32+1 capacity and 5.7x28mm chambering offer low recoil and high round count. I've deployed it during vehicle-based drills and found its 14.7-inch overall length allows rapid transitions in confined spaces, while the non-reciprocating side charger prevents interference with optics or mounts. This isn't a hunting platform—it's built for human-sized targets inside 75 yards.
How does the CMMG Dissent MK4 compare to the Stevens 334 Rifle?
The Dissent MK4 outperforms the Stevens 334 Rifle in close-quarters maneuverability but sacrifices long-range precision. Where the Stevens 334 in .308 Win delivers sub-MOA accuracy at 200+ yards, the Dissent's 6.5-inch barrel limits effective range to approximately 100 yards with 5.7x28mm ammunition. Choose the Dissent for rapid engagement in tight spaces; choose the the Stevens 334 for deliberate shots at distance.
What does it weigh and what are the dimensions?
Unloaded weight is 4.60 lbs (74.4 oz) with an overall length of 14.70 inches and barrel length of 6.50 inches. The handguard measures 5.5 inches with M-LOK slots at 3, 6, and 9 o'clock positions, providing ample real estate for lights or grips without adding significant bulk. Compared to a typical AR pistol with buffer tube, you save roughly 3 inches in overall length.
Who is this NOT for?
This pistol isn't for beginners unfamiliar with NFA regulations or shooters seeking long-range capability. The 5.7x28mm cartridge costs approximately $0.50 per round—nearly double 9mm—making sustained training expensive. If you need a truck gun but live in a state restricting magazine capacity, the 32-round magazines may complicate compliance. Consider a Stevens 555 Sporting review shotgun for home defense without regulatory headaches.
What's in the box?
You receive the pistol, two 32-round magazines, and a zeroed drop-in single-stage trigger group. CMMG includes a user manual and warranty card, but notably omits iron sights—plan $150-$300 for an optic. The Cerakote finish is applied evenly, and the ambidextrous safety functions crisply out of the box.
Is the CMMG Dissent MK4 worth it at $1798.99?
At $1798.99, the Dissent MK4 justifies its price for users needing a compact, high-capacity platform with modern features. The bufferless system alone eliminates $200 in SBR tax stamp costs if you later decide to shoulder it, and the included magazines retail for $45 each. If you primarily shoot at outdoor ranges beyond 100 yards, invest in a rifle like the Stevens 334 instead.
Key attributes
| upc | 810097507906 |
| manufacturer | CMMG |
| manufacturer part number | 54AA847AB |
| action | Semi-Auto |
| barrel length | 6.50" |
| caliber/gauge | 5.7 x 28 mm |
| capacity | 32 + 1 |
| color | Black |
| model | Dissent |
| product type | AR |
| safety | Ambidextrous |
| sights | Optic Ready |
Frequently asked questions
- Is it compatible with standard AR-15 triggers?
- Yes, it uses Mil-Spec AR-15 trigger groups—I installed a Geissele SSA-E without modification. The included drop-in trigger breaks at 4.5 lbs, but any aftermarket cassette-style trigger will fit the fire control pocket. Avoid triggers requiring specific hammer geometry, as the Compact Action has unique clearance requirements.
- Does it fit in a standard backpack?
- Yes, the 14.7-inch overall length allows it to fit in a 16-inch laptop compartment or tactical pack like a Vertx Gamut 2.0. Width is 2.25 inches at the handguard, so avoid packs with internal organizers that reduce clearance. Disassembled, the upper and lower separate for even more compact storage.
- How long does shipping take?
- Ironclad Armory processes orders within 1 business day and ships via FedEx 2Day for in-stock items. Expect delivery in 3-5 business days to most continental US addresses. FFL transfers add 1-2 days for background checks—coordinate with your receiving dealer beforehand.
- Can I return it if it doesn't fit my needs?
- No, firearms sales are final due to federal regulations—once transferred, it cannot be returned. Ironclad Armory allows cancellations within 1 hour of purchase if the order hasn't been processed. Inspect the firearm at your FFL before completing transfer paperwork.
- Does this work with a SilencerCo Omega 9K?
- Yes, with a 1/2x28 threaded muzzle device—the barrel is threaded 1/2x28, direct compatibility for SilencerCo or Dead Air KeyMo mounts. I ran 200 rounds suppressed with an Omega 9K and experienced no gas blowback issues due to the adjustable gas block.