CMMG DISSENT MK4 — 5.56 NATO, 16.1" Barrel, Semi-Automatic Rifle, Midnight Bronze Cerakote® | Model 55A1A0B-MB / 55A1A0BMB | UPC 810103479975
Purpose-built for modern shooters who want duty-tough reliability and refined ergonomics, the CMMG DISSENT MK4 (5.56 NATO) in Midnight Bronze Cerakote® brings the DISSENT family’s premium build quality to a handy 16.1" rifle configuration. With a free-float M-LOK® handguard, AR-pattern controls, and CMMG’s attention to gas and timing, this rifle delivers flat shooting, repeatable accuracy, and easy accessorizing—from LPVOs and red dots to lights, slings, and bipods.
Why the DISSENT MK4 Stands Out
5.56 NATO chamber — Run common training and defensive loads with reliable cycling and proven external ballistics.
16.1" barrel — The sweet spot for practical velocity, compact handling, and easy muzzle device/suppressor compatibility (where legal).
Free-float M-LOK® handguard — Rigid accessory mounting without contact on the barrel to maintain POI and accuracy.
Midnight Bronze Cerakote® — Low-glare, abrasion/corrosion-resistant finish that looks as tough as it runs.
AR-pattern ergonomics — Familiar controls for intuitive manipulation, faster learning curves, and cross-platform proficiency.
Quality parts integration — CMMG’s proven components and assembly standards support long-term reliability and consistent performance.
Built for Practical Precision
The DISSENT MK4’s free-float rail preserves barrel harmonics, so barricade pressure, bipods, and hand stops don’t disturb your zero. Pair it with an LPVO (1–6×/1–8×/1–10×) or a red dot + magnifier to cover everything from CQB distances to 500-yard steel (shooter, ammo, and conditions permitting). M-LOK slots give you flexible placement for white lights, pressure switches, QD sling cups, and bipods without adding unnecessary weight.
Handling & Control
Balanced 16.1" profile keeps the rifle lively on target while providing enough dwell time for consistent cycling.
AR-familiar control layout supports ambidextrous upgrades and speeds reloads and malfunction clears.
Recoil and muzzle behavior are easily tuned with your choice of brake, comp, or suppressor mount (where legal).
Range-Ready Versatility
Whether you’re building a do-everything ranch rifle, a training workhorse, or a competition-curious carbine, the DISSENT MK4’s 5.56 NATO chambering, free-float M-LOK rail, and durable finish make it a flexible foundation. It’s ready for carbine classes, range days, property defense, and 3-Gun-style drills with the magazines you already trust.
Magazine compatibility: Standard AR-15 pattern 5.56/.223 magazines. (Included magazine count may vary—check your specific product listing.)
Ideal Use Cases
Training & carbine courses — Reliable, accurate, and easy to maintain during high round counts.
Home/property defense — Familiar controls and broad ammo availability.
Practical competition — Free-float rail and optic-friendly setup make it stage-ready.
Ranch/utility role — Durable finish and simple maintenance for hard daily use.
Setup Tips for Best Results
Optic pairing: LPVO (1–6×/1–8×) for general purpose; red dot + 3× magnifier for speed and mid-range reach.
Slinging: Add QD cups front/rear and run a two-point sling for support-side transitions and stability.
Muzzle device: Choose a compensator for flat splits, a flash hider for low signature, or a suppressor mount (where legal). Re-confirm zero after any device change.
Zero & data: Establish a 50/200 or 100-yard zero, confirm holds at 300–400, and build a quick-reference card for your preferred load.
Care & Maintenance
Keep the BCG lightly lubricated; wipe carbon and re-lube during extended sessions.
Torque-check optics mounts and handguard fasteners after initial heat cycles.
Inspect gas system screws, castle nut, and muzzle device for tightness per manufacturer specs.
Clean chamber/bore on a sensible interval; track accuracy and adjust your routine accordingly.
Specifications (At a Glance)
Model / SKU: 55A1A0B-MB / 55A1A0BMB
UPC: 810103479975
Caliber: 5.56 NATO (accepts .223 Remington)
Action: Semi-automatic, AR-pattern
Barrel Length: 16.1 inches
Handguard: Free-float M-LOK®
Finish/Color: Midnight Bronze Cerakote®
Controls: AR-style (compatible with common ambi upgrades)
Magazine Type: AR-15 pattern 5.56/.223 (capacity may vary by jurisdiction and package)
Exact small-part configuration (trigger, muzzle device, sights, and included accessories) can vary by production lot. Always refer to the current product box contents or listing details.
SEO-Friendly Highlights (Quick Scan)
CMMG DISSENT MK4 5.56 semi-auto rifle
16.1" barrel, free-float M-LOK® handguard
Midnight Bronze Cerakote® durable finish
AR-pattern controls, optic-ready, magazine compatible with standard AR-15
Model 55A1A0B-MB / 55A1A0BMB | UPC 810103479975
The Bottom Line
The CMMG DISSENT MK4 (5.56 NATO) in Midnight Bronze is a do-more carbine: accurate, reliable, and ready to configure for your mission. With its 16.1" barrel, free-float M-LOK rail, and AR-familiar ergonomics, it’s a rugged, modern rifle that makes smart upgrades easy and consistent performance the norm.
The End
