CMMG MK4: Versatile Semi Auto Firearm with Vortex Scope & Keymod Handguard

The modern sporting rifle that balances range, control, and optics-ready capability is a versatile tool for duty, competition, and home defense. With a mid-length gas system, an optic that covers close to medium engagement, and a chassis optimized for accessory mounting, this platform is built for shooters who want reliable performance without compromising ergonomics.

CMMG MK4

CMMG MK4 right-side profile with Vortex optic

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Deadline: Feb 1, 2026
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The CMMG MK4 is listed in the Semi Auto category and comes as a Certified Used Firearm for $1,299.99. Certified Used status means the rifle is inspected to be in very good to excellent condition and includes a ‘no questions asked’ return policy—an important assurance when buying a high-value firearm.

Design and key specifications

This model uses a mid-length system with a 1/7 twist barrel, which supports stabilization of a wide range of projectile weights—ideal if you plan to run heavier bullets for extended-range accuracy or standard loads for daily use. The rifle ships with one 30-round magazine and a muzzle brake to reduce recoil impulse and follow-up time.

Ergonomics and control

Ergonomic upgrades include a Magpul MOE pistol grip and a CTR adjustable stock for quick adjustments and a solid cheek weld. The Keymod handguard provides a lightweight mounting platform for lights, grips, or rail sections where you need them, keeping weight down and balance centered.

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Optics and practical use

The included Vortex Strike Eagle 1-6×24 illuminated reticle scope gives fast target acquisition at 1x and meaningful precision at 6x—ideal for multi-role use from close quarters to mid-range. The 1/7 twist pairs well with that optic choice, providing a stable bullet flight for heavier projectiles when you stretch distances.

Why choose a Certified Used CMMG MK4

Certified Used rifles deliver cost savings while maintaining quality. At $1,299.99, the CMMG MK4 offers a compelling value compared with new equivalents, and the return policy reduces purchase risk. Check product specifics and verify current stock.

CMMG MK4 close-up of keymod handguard and Vortex optic

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People Also Ask

What makes this product stand out from competitors?

This product offers superior quality and innovative features that set it apart in the market. Its design focuses on both performance and reliability, making it a top choice for professionals and enthusiasts alike.

Is this product suitable for beginners?

Yes, this product is designed with user-friendly features that make it accessible to beginners while still offering advanced capabilities for experienced users.

What warranty or support is available?

The product comes with comprehensive warranty coverage and excellent customer support to ensure your satisfaction and peace of mind.

How does this compare to similar products in its price range?

This product offers exceptional value for its price point, providing features and quality that typically cost significantly more in comparable alternatives.

What maintenance is required?

Minimal maintenance is required thanks to the product’s durable construction and quality materials. Regular cleaning and occasional inspections will keep it performing optimally.

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