CMMG ENDEAVOR Mk4 — 22 ARC, 20" Barrel, 10-Round, Charcoal Green
Brand: CMMG • Series: ENDEAVOR Mk4 (AR-15 platform) • Caliber: 22 ARC (Advanced Rifle Cartridge) • Barrel Length: 20 inches • Capacity: 10+1 • Color: Charcoal Green • Model/SKU: 28A7F0C-CG / 28A7F0CCG • UPC: 810148627126
Meet the lightweight AR that shoots like a laser. The CMMG ENDEAVOR Mk4 in 22 ARC with a 20" barrel is purpose-built for precision—pairing the flat-shooting, wind-defying 22 ARC cartridge with a free-floated handguard, AR-15 ergonomics, and a durable Charcoal Green finish. From prairie dogs to coyotes to long-range steel, this 10-round, suppressor-ready rifle delivers the balance, consistency, and confidence you want in the field and on the clock.
Why 22 ARC + ENDEAVOR Mk4 is a Game-Changer
High-BC .224 bullets, low recoil: The 22 ARC is engineered around heavy-for-caliber projectiles for excellent wind performance and retained velocity—without big-frame recoil.
AR-15 familiarity: Standard controls, intuitive handling, and enormous accessory support mean you can shoot better, sooner.
20" velocity sweet spot: The longer tube extracts more speed and tighter SDs for predictable dope at distance.
Free-float precision: A rigid M-LOK® handguard isolates the barrel for consistent POI from bags, bipods, and barricades.
Key Features
Caliber: 22 ARC (.224 bore, optimized for 75–88+ grain bullets)
Barrel: 20" precision barrel, threaded muzzle (suppressor/brake compatible; confirm thread pitch)
Gas System: AR-15 direct-impingement style operation for smooth cycling and easy maintenance
Handguard: Free-float M-LOK with ample slots for bipods, QD cups, ARCA adapters, and lighting/thermals
Receivers: AR-15 pattern, optics-ready upper with continuous Picatinny top rail
Furniture: Adjustable stock and ergonomic grip (configuration may vary by shipment)
Finish: Charcoal Green for a modern, low-glare field aesthetic
Capacity: 10-round magazine (state-friendly)*
Model/SKU: 28A7F0C-CG / 28A7F0CCG • UPC: 810148627126
*Always follow local laws regarding magazine capacity and firearm features.
Performance Advantages You’ll Notice
Flatter Trajectories, Cleaner Holds: Heavy .224 bullets carry energy and resist wind drift, reducing corrections beyond 300 yards.
Stay on Target: Mild recoil lets you spot impacts through glass and make faster follow-up shots—huge for varmints and practical precision.
Tripod & Barricade Ready: Long handguard, anti-flex design, and easy M-LOK mounting give you stable contact points for any stage or field position.
Suppressor Friendly: Threaded muzzle accepts brakes, comps, and .22-cal cans to reduce blast and improve shot calling (verify suppressor rating and thread).
Ideal Use Cases
Predator & Varmint: Coyotes, fox, and prairie dogs at extended range with minimal recoil fatigue.
Gas-Gun Precision Training: Practice wind calls and positional shooting on an AR that mimics your match workflow.
Ranch/Property Management: Lightweight, accurate, and ready to ride on the UTV with sleek Charcoal Green durability.
Crossover Long-Range: Ring steel at distance while keeping AR-15 portability and parts support.
Setup Tips for Best Results
Magazines: 22 ARC typically runs best in 6.5 Grendel-pattern AR-15 magazines due to case geometry and longer COAL.
Optics: Choose a quality FFP 3-15x or 4-16x with a wind tree and trustworthy tracking.
Support Gear: Add a cant-adjustable bipod and a rear bag; consider an ARCA plate if you shoot from tripods.
Ammo: Test several 75–88+ gr factory loads; log MV and SDs to build reliable dope.
Gas/Buffer Tuning: If you add a suppressor or different muzzle device, fine-tune for smooth ejection and minimal sight movement.
Specifications (At a Glance)
Platform: AR-15 / ENDEAVOR Mk4
Caliber: 22 ARC
Barrel: 20", threaded
Handguard: Free-float M-LOK
Capacity: 10+1
Color: Charcoal Green
Model/SKU: 28A7F0C-CG / 28A7F0CCG
UPC: 810148627126
Note: Exact twist rate, thread pitch, furniture, and included accessories may vary by production. Check your rifle’s package contents for specifics.
Care & Maintenance
Break-In & Clean: Follow CMMG’s guidance; keep chamber, gas system, and crown spotless for best precision.
Fastener Discipline: Torque M-LOK hardware and optic mounts to spec; use blue threadlocker where appropriate.
Data Tracking: Record muzzle velocity, density altitude, and wind for each lot—22 ARC rewards consistent data with consistent hits.
SEO Highlights (Copy & Paste)
CMMG ENDEAVOR Mk4 22 ARC 20" Charcoal Green
10-round AR-15 precision rifle with free-float M-LOK handguard
Suppressor-ready threaded barrel; optimized for heavy .224 bullets
Ideal for predator hunting, varmint, and long-range training
Model 28A7F0C-CG / 28A7F0CCG • UPC 810148627126
Frequently Asked Questions
Q: What magazines should I use?
A: 6.5 Grendel-pattern AR-15 magazines typically provide the most reliable feeding with 22 ARC.
Q: Is a 20" barrel long enough for distance?
A: Yes—20 inches is a proven balance of velocity and handling for stretching 22 ARC to practical long-range distances.
Q: Can I run a suppressor?
A: The barrel is threaded. Confirm thread pitch and ensure your suppressor is rated for high-velocity .224 centerfire cartridges.
Q: What bullet weights perform best?
A: The cartridge shines with 75–88+ grain bullets for superior BC and wind performance.
Q: Is this standard AR-15 compatible?
A: Controls and furniture follow AR-15 norms. The 22 ARC uses a Grendel/ARC bolt face and typically prefers Grendel-pattern mags.
Precision without the Punishment
From prairie flats to steel ranges, the CMMG ENDEAVOR Mk4 22 ARC 20" (Charcoal Green) delivers long-range capability, soft recoil, and AR-15 familiarity—Model 28A7F0C-CG / 28A7F0CCG, UPC 810148627126. Mount quality glass, feed it high-BC ammo, and watch your hit percentage climb.
The End
