CMMG Dissent MK4 – .300 Blackout AR Pistol, 10.50" Barrel, 30+1, Armor Black – 30AC50F-AB
Caliber: .300 AAC Blackout • Capacity: 30+1 • Barrel: 10.50" 4140 Chrome-Moly, Black Nitride, Threaded 5/8x24 • Handguard: 5.50" M-LOK • Receiver: 7075-T6 Aluminum, Black Armor Cerakote, Picatinny Rear Rail • Grip: CMMG Zeroed • UPC: 840442500986
The CMMG Dissent MK4 300 Blackout 30+1 with 10.50" Black Nitride Threaded Barrel and 5.50" M-LOK Handguard (30AC50F-AB) is a next-generation AR pistol built for shooters who demand maximum power in an ultra-compact, bufferless platform. Featuring CMMG’s patent-pending Compact Action and side-charging system, this DISSENT offers .30-cal performance, AR-15 ergonomics, and sleek Armor Black Cerakote styling in a package that excels as a personal defense weapon, truck gun, or compact suppressed host.
Compact Action – Bufferless 300 BLK Performance
What sets the DISSENT apart is CMMG’s Compact Action:
The entire recoil system is housed in the upper receiver, eliminating the need for a traditional buffer tube or receiver extension.
This bufferless design allows for an extremely short overall length, making it ideal for vehicles, tight spaces, or discreet carry in small cases.
You still get familiar AR-15 controls—mag release, safety, and bolt catch—so if you already run ARs, the manual of arms feels instantly natural.
The result is a true AR-pattern PDW that keeps reliability and ergonomics while shedding the bulk of a traditional buffer system.
10.50" Black Nitride Barrel – Optimized for .300 Blackout
The Dissent MK4 takes full advantage of .300 BLK’s strengths with its 10.50" barrel:
4140 chrome-moly steel barrel treated with a Black Nitride (SBN) finish for enhanced corrosion resistance, hardness, and barrel life.
1:7" twist rate stabilizes both heavy subsonic and lighter supersonic .300 BLK loads, giving you true do-it-all capability.
Threaded 5/8x24 muzzle makes it ready for your favorite suppressor, brake, or comp right out of the box.
.300 BLK is specifically designed to perform well from short barrels; the 10.50" length maximizes velocity and energy while still keeping the pistol extremely compact.
Whether you’re setting this up as a dedicated suppressed subsonic host or a do-everything defensive pistol with supersonic loads, the barrel is tuned for the job.
5.50" M-LOK Handguard & Armor Black Aluminum Receiver
Up front, the Dissent MK4 uses a 5.50" M-LOK handguard paired with a rugged aluminum receiver set:
Compact 5.50" free-float M-LOK handguard provides just enough rail space for essentials—like a white light or laser—without adding unnecessary bulk.
Full-length Picatinny rail on the receiver offers a rock-solid mounting surface for red dot optics or low-power variables.
Receiver is machined from 7075-T6 aluminum and finished in Black Armor Cerakote, delivering a tough, corrosion-resistant, low-glare finish built for hard use.
The short handguard length also helps keep weight centered toward the shooter, improving handling and control during rapid strings of fire.
Forward Non-Reciprocating Side Charger & Ambidextrous Controls
The DISSENT is designed from the ground up for modern ergonomics and ambidextrous operation:
Forward non-reciprocating side charging handle—mounted on the upper—allows you to charge and clear the pistol without breaking your firing grip or reaching for a rear charging handle.
Charger can be swapped for left- or right-handed use, making the pistol truly ambi-friendly.
Standard AR-15 ambidextrous controls (including CMMG Zeroed 60/90-degree safety selector on many Dissent models) keep the manual of arms familiar and efficient.
These features make the Dissent MK4 especially appealing to left-handed shooters and anyone who values fast, intuitive manipulation under stress.
Suppressor-Ready with Adjustable Gas System
.300 Blackout shines when suppressed—CMMG configures the DISSENT accordingly:
Dissent 300 BLK models are equipped with an adjustable gas block, allowing you to fine-tune the system for both subsonic and supersonic ammo and suppressed or unsuppressed configurations.
Tuning the gas system helps reduce blowback, manage recoil, and improve reliability across different loads and suppressors.
If you’re building a dedicated suppressor host, the Dissent’s adjustable gas and short overall length put it at the top of the list.
CMMG Zeroed Grip, Trigger & Fire Control Enhancements
CMMG rounds out the package with their Zeroed line of components:
CMMG Zeroed grip offers a comfortable, modern angle for better wrist alignment and control in compact PDW setups.
Many Dissent MK4 configurations feature a Zeroed drop-in single-stage trigger, giving you a clean, predictable pull for faster, more accurate shooting.
Zeroed 60/90-degree safety selector (where equipped) lets you choose your preferred throw angle to match your muscle memory and setup.
These small details add up to a pistol that shoots and feels like a purpose-built premium platform, not a parts-bin build.
Ultra-Compact, Ready-for-Optics PDW Platform
The CMMG Dissent MK4 300 BLK is made to thrive where space is at a premium:
Overall length around 15.7" and weight about 4.8 lbs, making it extremely compact and easy to stage, store, or transport in vehicles and discreet cases.
Ships with no fixed sights, so you can choose your preferred red dot, LPVO, or night-vision-capable optic right on the receiver rail.
Standard 30-round .300 BLK magazine capacity (30+1) ensures plenty of firepower in a PDW-sized package.
From home defense to range training to specialized roles, this configuration is built to be compact, controllable, and highly configurable.
Key Specifications – CMMG Dissent MK4 300 Blackout 30AC50F-AB
From CMMG and major retailers:
Manufacturer: CMMG
Model: Dissent MK4
SKU / MPN: 30AC50F-AB
UPC: 840442500986
Caliber: .300 AAC Blackout
Capacity: 30+1
Action: Semi-auto, Compact Action (bufferless direct impingement)
Operating System: Direct Impingement, recoil system contained in upper receiver
Barrel Length: 10.50"
Barrel Material: 4140 Chrome-Moly, Black Nitride
Twist Rate: 1:7"
Muzzle Threads: 5/8x24, threaded, suppressor-ready
Handguard: 5.50" free-float M-LOK
Receiver Material: 7075-T6 aluminum
Receiver Finish: Black Armor Cerakote, with rear Picatinny rail
Charging System: Forward non-reciprocating side charger, reversible for left/right
Grip: CMMG Zeroed
Trigger: Zeroed single-stage (model-dependent, see current spec)
Safety: CMMG Zeroed 60/90-degree selector (model-dependent)
Overall Length: ~15.7"
Weight: ~4.8 lbs
Sights: None (optics-ready)
Always verify your local, state, and federal laws regarding AR pistols, braces/stocks, and suppressor use before configuring your Dissent MK4.
SEO-Focused Summary
The CMMG Dissent MK4 300 Blackout 30+1 10.50" Black Nitride Threaded Barrel, 5.50" M-LOK Handguard, Black Armor Cerakote Aluminum Picatinny Rail Receiver, Black CMMG Zeroed Grip 30AC50F-AB (UPC 840442500986) is a premium bufferless AR pistol that combines CMMG’s Compact Action, adjustable gas system, forward non-reciprocating side charger, and optics-ready Armor Black receiver into an ultra-compact .300 BLK PDW platform. With a 10.50" nitride barrel optimized for subsonic and supersonic .300 Blackout, a 5.50" M-LOK handguard, Zeroed controls, and 30+1 capacity, the Dissent MK4 300 Blackout is an outstanding choice for shooters seeking a high-end, modular, suppressor-ready defensive or range pistol in a compact, modern package.
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