CMMG DISSENT Mk4 — .300 Blackout AR Pistol | 10.5" Threaded Barrel (5/8x24) | Midnight Bronze Cerakote | 30 Rounds, 2 Magazines | Model 30AC278-MB / 30AC278MB | UPC 810097509672
Compact, modern, and built to run subsonic or supersonic loads, the CMMG DISSENT Mk4 in .300 Blackout turns a proven AR architecture into a sleek, high-performance pistol. The 10.5" threaded barrel (5/8x24) pairs perfectly with .300 BLK’s short-barrel efficiency—delivering reliable cycling, excellent controllability, and effortless suppressor integration (where legal). Wrapped in a premium Midnight Bronze Cerakote finish and shipped with (2) 30-round magazines, this DISSENT is ready for defensive duty, range work, and low-signature setups.
Why This DISSENT Stands Out
Optimized for .300 BLK: Purpose-built to run subsonic and supersonic ammunition, making it a versatile platform for home defense, training, and suppressed use.
10.5" threaded barrel, 5/8x24: The ideal length and pitch for .300 BLK muzzle devices and suppressors; balances velocity with compact handling.
Midnight Bronze Cerakote: A durable, low-glare finish that resists corrosion and abrasion while adding a premium, modern aesthetic.
AR-pattern familiarity: Intuitive controls and compatibility with common accessories help you configure the pistol to your mission.
30-round capacity with (2) mags included: Out-of-the-box readiness for classes, drills, and duty rotation (observe local laws).
Performance Advantages You’ll Notice
Soft, trackable recoil impulse: .300 BLK’s pressure curve in a 10.5" barrel supports fast follow-up shots and easier dot tracking.
Suppressor-friendly DNA: The threaded muzzle simplifies mounting a can for low-signature operation and reduced perceived blast (where permitted).
Free-float handguard: A rigid, M-LOK® compatible rail (length may vary by production) keeps accessories locked down and the barrel free for consistent accuracy.
Duty-grade reliability: Quality components and assembly deliver consistent feeding and ejection across a wide range of loads.
Ideal Use Cases
Home & property defense: Compact maneuverability with excellent terminal options and reduced side blast compared to braked 5.56 setups.
Suppressed range work: Pair with heavy subsonics for signature-reduced training and practice (follow NFA/local regulations).
Truck/UTV gun: Short OAL and robust finish make it easy to stage, carry, and deploy.
Training carbine substitute: Runs like your rifle with lower concussion and excellent controllability.
Pro Setup Tips
Optic: A durable micro red dot (36-yard or 50/200 zero) excels on .300 BLK. Consider a flip-to-side magnifier for flexible distance work.
White light: Add a compact M-LOK light at 10:30 or 1:30 with a remote switch for positive ID without compromising your grip.
Sling: A 2-point QD sling stabilizes shooting positions and supports hands-free tasks.
Ammo pairing: Test both supersonic and subsonic loads; confirm reliability unsuppressed and suppressed. Log dope for each load.
Muzzle device: Use quality thread protectors, comps, or suppressors; apply proper torque and verify concentricity before live fire.
Key Features at a Glance
Platform: CMMG DISSENT Mk4 semi-automatic AR pistol
Caliber: .300 AAC Blackout
Barrel: 10.5", threaded 5/8x24
Finish: Midnight Bronze Cerakote (low-glare, corrosion-resistant)
Handguard: Free-float M-LOK (accessory-ready)
Capacity: 30 rounds
Magazines: (2) included
Model / SKU: 30AC278-MB / 30AC278MB
UPC: 810097509672
Specifications
| Attribute | Detail |
|---|
| Type | Semi-automatic AR-pattern pistol |
| Caliber | .300 AAC Blackout |
| Barrel Length | 10.5 inches |
| Thread Pitch | 5/8x24 |
| Handguard | Free-float, M-LOK compatible |
| Finish | Midnight Bronze Cerakote |
| Controls | AR-style; ambidexterity dependent on configuration |
| Capacity | 30+1 (where legal) |
| Magazines Included | 2 |
| Model / SKU | 30AC278-MB / 30AC278MB |
| UPC | 810097509672 |
Compliance Note: Magazine capacity and pistol/suppressor configurations are regulated in many jurisdictions. Verify local and state laws before purchase, transfer, or modification.
Maintenance & Care
Keep the BCG, charging surfaces, and contact points lightly lubricated, especially with subsonic/suppressed use.
Inspect muzzle threads and devices periodically; re-torque and re-apply anti-seize as needed for suppressor hosts.
Re-check optic/sling/light fasteners after the first 100–200 rounds and after any hard use.
SEO Highlights (for Merchandising & Search)
CMMG DISSENT Mk4 .300 Blackout pistol, 10.5" threaded barrel 5/8x24, Midnight Bronze Cerakote, AR pistol 30-round capacity, includes 2 magazines, free-float M-LOK handguard, suppressed-ready 300 BLK AR pistol, 30AC278-MB / 30AC278MB, UPC 810097509672.
**Compact where it counts and confident on demand—the CMMG DISSENT Mk4 .300 Blackout with a 10.5" barrel and Midnight Bronze Cerakote is a versatile, suppressor-friendly AR pistol that’s ready for defense, training, and everyday range work right out of the box.
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