CMMG DISSENT MK4 — 6mm ARC, 16.1" Barrel, Semi-Automatic Rifle, Midnight Bronze Cerakote® | Model 60AA90C-MB / 60AA90CMB | UPC 810144721583

Stretch your AR’s practical range without jumping to a large-frame platform. The CMMG DISSENT MK4 in 6mm ARC pairs a 16.1" barrel with a rugged Midnight Bronze Cerakote® finish to deliver flat trajectories, excellent wind performance, and dependable accuracy in a maneuverable package. With AR-familiar controls and an optic-ready top rail, this DISSENT MK4 is a modern, do-more carbine for predators, steel, and open-country hunts.

Why Choose the DISSENT MK4 in 6mm ARC

• 6mm ARC chambering — Purpose-built for high-BC bullets, giving you flatter flight, less wind drift, and stronger retained energy than traditional .22-cal AR loads.

• 16.1" barrel — The sweet spot for velocity and balance; stays lively in the field while providing the reach 6mm ARC deserves.

• Free-float M-LOK® handguard (typical MK4 configuration) — Rigid accessory mounting with no barrel contact for consistent point of impact.

• Midnight Bronze Cerakote® — Low-glare, abrasion- and corrosion-resistant finish that thrives through weather, classes, and travel.

• AR-pattern ergonomics — Familiar manual of arms with broad compatibility for triggers, stocks, grips, and magazines.

• Optic-ready receiver — Run an LPVO, precision scope, or red dot + magnifier to match your mission.

Note: Exact furniture, muzzle device, and small-part configuration can vary by production lot. Always check current box contents or the retailer listing for specifics.

6mm ARC: Long-Range Confidence from an AR-15 Footprint

Developed for efficient, high-BC 6mm projectiles, 6mm ARC delivers flatter trajectories and better wind calls versus many .223/5.56 setups—without the weight and bulk of a .308-size rifle. That means:

• Easier dope at distance, especially in the wind

• Satisfying steel hits at ranges where .223 starts to struggle

• Predator-ready performance with purpose-built 6mm bullets

Built for Practical Precision

A free-float handguard preserves barrel harmonics so barricade pressure, bipods, or hand stops won’t nudge your zero. The continuous top rail simplifies eye relief and mount placement, whether you prefer a 1–6×/1–8×/1–10× LPVO for all-around use or a 3–15×/4–16× for load development and longer shots. M-LOK® slots give you flexible mounting for white lights, QD sling cups, bipods, and pressure pads—without crowding your support hand.

Handling, Control & Versatility

• Balanced 16.1" profile keeps transitions quick from prone to positional shooting.

• Muzzle device ready — Choose a flash hider, brake, or suppressor mount (where legal) and confirm POI after installation.

• Rifle-class reliability — CMMG’s manufacturing standards and component fitment support consistent cycling across quality 6mm ARC loads.

Ideal Use Cases

• Predator & varmint in open country where wind and distance matter

• Steel/practical rifle training out to extended ranges

• Backcountry/ranch utility where durability and accuracy are equally important

• Ammo/load development for high-BC 6mm bullets in an AR-15 platform

Setup Tips for Best Results

• Optic pairing: LPVO for do-all flexibility; mid-power precision scope for load tuning and longer holds.

• Zero strategy: A 100-yard zero simplifies ballistic tables; verify your holds through 400–700 yards based on load and elevation.

• Dope card: Build data for your preferred 103–108gr high-BC bullets; record velocity, ES/SD, and confirmed drops in real conditions.

• Muzzle device swaps: Re-check torque and reconfirm zero anytime you change devices or add a suppressor.

Care, Safety & Compliance

• Know your laws regarding feature configuration, magazine capacity, and suppressors.

• Maintenance: Keep the BCG lightly lubricated and check optic/handguard fasteners after initial heat cycles.

• Ammunition: Use reputable 6mm ARC loads and confirm function before field use.

Specifications (At a Glance)

• Model / SKU: 60AA90C-MB / 60AA90CMB

• UPC: 810144721583

• Caliber: 6mm ARC

• Action: Semi-automatic, AR-pattern

• Barrel Length: 16.1 inches

• Handguard: Free-float M-LOK® (typical MK4 configuration)

• Finish/Color: Midnight Bronze Cerakote®

• Receiver: AR-15 pattern, optic-ready top rail

• Magazine Type: AR-15 compatible (capacity may vary by package/region)

• Muzzle Threads/Device: Threaded barrel; device may vary by lot

SEO-Friendly Highlights (Quick Scan)

• CMMG DISSENT MK4 6mm ARC semi-auto rifle

• 16.1" barrel, free-float M-LOK® handguard, Midnight Bronze finish

• AR-pattern controls, optic-ready, suppressor-friendly setup (where legal)

• Ideal for predator hunting, steel/practical rifle, and open-country shooting

• Model 60AA90C-MB / 60AA90CMB | UPC 810144721583

The Bottom Line

The CMMG DISSENT MK4 (6mm ARC) in Midnight Bronze brings long-range confidence to a nimble AR-15 platform. With its 16.1" barrel, free-float construction, and optic-ready receiver, it’s a smart, future-proof rifle that keeps shots flat, wind calls honest, and performance consistent—from the range to wide-open country.

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