Elevating Precision: A Deep Dive into the CMMG Endeavor 300 MK4 6mm ARC Rifle

For shooters who demand unwavering precision, extended-range capability, and a robust platform, the CMMG Endeavor 300 MK4 chambered in 6mm ARC stands as a formidable contender. This rifle is not just another AR-style firearm; it's a meticulously engineered system designed to push the boundaries of accuracy, making it an ideal choice for serious long-range enthusiasts, competitive shooters, and discerning hunters.

Are you searching for a rifle that can consistently hit targets at distances previously considered challenging for the AR-15 platform? Do you need a high-performance gas gun for Precision Rifle Series (PRS) Gas Gun division competitions? Or perhaps you're a varmint hunter looking for a cartridge that delivers devastating energy and minimal wind drift at extended ranges? The CMMG Endeavor 300 MK4 in 6mm ARC answers these questions and more, offering a purpose-built solution for a variety of demanding shooting scenarios.

Unlocking Long-Range Potential: The 6mm ARC Advantage

At the heart of the CMMG Endeavor 300 MK4's impressive capabilities lies its chambering: the innovative 6mm ARC (Advanced Rifle Cartridge). Developed by Hornady, the 6mm ARC was specifically designed to deliver exceptional ballistic performance from the AR-15 platform, bridging the gap between smaller cartridges like .223/5.56mm and larger, heavier options.

What makes the 6mm ARC so compelling for precision shooting and hunting?

• Superior Ballistics: The 6mm ARC excels with heavy-for-caliber 6mm bullets (typically 103-108 grains) that boast incredibly high ballistic coefficients (BCs). This means they retain energy better, resist wind drift more effectively, and fly flatter over extended distances compared to traditional AR-15 cartridges. For example, a 108-grain ELD Match bullet in 6mm ARC can maintain supersonic velocity beyond 1000 yards from a 20-inch barrel, a feat few other AR-15 compatible cartridges can match.
• Reduced Recoil: Despite its impressive performance, the 6mm ARC produces significantly less recoil than larger short-action cartridges often used for long-range shooting. This translates to a more comfortable shooting experience, faster follow-up shots, and the ability to spot your own impacts through the scope, a critical advantage in competitive shooting.
• AR-15 Compatibility: Built on the AR-15 platform, the 6mm ARC allows users to leverage the vast ecosystem of AR accessories, parts, and ergonomics they are already familiar with. This keeps the rifle's footprint manageable while delivering big-bore performance.
• Versatility for Diverse Applications: While exceptional for target shooting, the 6mm ARC is also highly effective for hunting. Its energy and bullet construction options make it suitable for varmints like coyotes and prairie dogs, as well as medium game such as deer and hogs, providing clean, ethical harvests within appropriate ranges.

The decision to chamber the Endeavor 300 MK4 in 6mm ARC underscores CMMG's commitment to delivering cutting-edge performance to discerning shooters.

The CMMG Endeavor 300 MK4: A Foundation of Excellence

CMMG is renowned for manufacturing high-quality AR-platform firearms, and the Endeavor 300 MK4 is a prime example of their expertise. This rifle leverages the proven direct impingement operating system, refined for optimal performance with the 6mm ARC cartridge. Every component is selected and assembled to contribute to the rifle's overall precision and reliability.

Let's explore the specific features that elevate the CMMG Endeavor 300 MK4:

Precision 20-Inch Barrel

The 20-inch barrel length is a strategic choice for the 6mm ARC. This length allows the cartridge to achieve optimal muzzle velocities, maximizing its ballistic potential and ensuring that those high-BC bullets reach their intended targets with authority. CMMG barrels are typically crafted from 416R stainless steel, known for its excellent resistance to erosion and its ability to hold precise rifling. The barrel features a refined twist rate (often 1:7.5" or 1:8") specifically optimized to stabilize the heavier 6mm projectiles, guaranteeing consistent sub-MOA accuracy. The barrel contour is designed to provide rigidity and dissipate heat effectively, preventing significant point-of-impact shifts during extended strings of fire.

Durable Titanium Cerakote Receiver

A striking and functional feature of this rifle is its Titanium Cerakote finish on the receiver. Cerakote is a ceramic-based coating known for its exceptional durability, resistance to abrasion, corrosion, and chemical exposure. The Titanium finish not only provides a sophisticated aesthetic but also adds an extra layer of protection, ensuring the rifle withstands harsh environmental conditions and the rigors of extensive use. This finish also contributes to the rifle's overall appeal and longevity, maintaining its pristine appearance even after countless hours at the range or in the field.

Fully Adjustable Magpul PRS Stock

Ergonomics are paramount in precision shooting, and the CMMG Endeavor 300 MK4 comes equipped with the highly regarded Magpul PRS (Precision Rifle/Sniper) Gen3 stock. This stock is a favorite among precision shooters for its extensive adjustability and rock-solid stability.

Key features of the Magpul PRS Gen3 stock include:

• Tool-Less Adjustments: Shooters can quickly and easily adjust the length of pull and comb height to achieve a perfect, custom fit. This adaptability ensures comfort and consistent cheek weld for any shooter, regardless of body type, and accommodates various optics and shooting positions.
• Enhanced Stability: The PRS stock features multiple sling attachment points and a solid, wide base that provides excellent stability when shooting from a bench or prone position, further enhancing accuracy. Its robust construction minimizes flex, ensuring a consistent platform shot after shot.
• Comfort and Control: The ergonomic design of the PRS stock allows for natural eye alignment with the scope and provides a comfortable interface, reducing fatigue during long shooting sessions.

The inclusion of the Magpul PRS Gen3 stock directly addresses the needs of precision shooters who require a rifle that can be precisely tailored to their individual preferences and shooting style.

Other Critical Components for Enhanced Performance

Beyond these core features, the CMMG Endeavor 300 MK4 integrates several other high-quality components that contribute to its overall performance:

• Free-Float Handguard: A free-float M-LOK handguard ensures that pressure from bipods or sling tension does not affect barrel harmonics, preserving accuracy. The M-LOK system allows for easy attachment of accessories like bipods, lights, and additional rail sections.
• Enhanced Trigger Group: While specific trigger details may vary, CMMG Endeavor series rifles typically feature a high-quality single-stage or two-stage trigger designed for a crisp, predictable break. A clean trigger pull is fundamental to precision shooting, minimizing shooter-induced errors.
• Muzzle Device: The rifle comes equipped with a functional muzzle device, such as a compensator or flash hider, which helps manage recoil and muzzle rise, allowing for faster follow-up shots and better shot observation.
• Durable Magazines: The rifle is supplied with reliable magazines, typically 10-round capacity to adhere to various regulations and provide sufficient rounds for precision work without excessive bulk.

Real-World Applications and User Outcomes

The CMMG Endeavor 300 MK4 in 6mm ARC is engineered to deliver exceptional results across various shooting disciplines:

• Long-Range Target Shooting: For those aiming to consistently hit steel or paper targets at 600, 800, 1000 yards, or even further, this rifle provides the necessary ballistic horsepower and inherent accuracy. Shooters can expect tighter groups and more confident engagements at extended distances.
• Competitive Shooting (PRS Gas Gun): The combination of the precise 6mm ARC cartridge, the AR-15 platform's ergonomics, and the rifle's stability makes it a strong contender for PRS-style competitions. Competitors can benefit from reduced recoil for faster follow-up shots and a rifle that can be customized to excel in dynamic stages.
• Varmint and Predator Hunting: The 6mm ARC's flat trajectory and energy retention make it a superb choice for ethical and effective varmint and predator control at ranges where traditional rimfire or smaller centerfire cartridges fall short. Hunters will appreciate the precision needed for challenging shots on small, distant targets.
• Medium Game Hunting: With appropriate bullet selection, the 6mm ARC in the CMMG Endeavor 300 MK4 is capable of taking medium-sized game like deer and hogs within realistic hunting distances, offering a lightweight yet potent hunting platform.

Users of this rifle report high levels of satisfaction, frequently noting its consistent sub-MOA accuracy, manageable recoil, and the distinct advantage provided by the 6mm ARC cartridge. It’s a rifle that builds confidence in the shooter, leading to improved performance and a more rewarding shooting experience.

Optimizing Your CMMG Endeavor 300 MK4 Setup

To truly unlock the full potential of your CMMG Endeavor 300 MK4 6mm ARC rifle, consider these essential accessories and practices:

• High-Quality Optics: A premium variable-power scope with clear glass, a precise reticle, and reliable turrets is non-negotiable for long-range shooting. Look for optics with sufficient magnification (e.g., 5-25x, 6-36x) and features like parallax adjustment.
• Bipod: A sturdy bipod, preferably one that attaches to the M-LOK handguard, will provide a stable shooting platform for prone or bench rest shooting, crucial for maximizing accuracy.
• Ammunition Selection: Experiment with different 6mm ARC ammunition types and bullet weights to find what your specific rifle prefers. Match-grade ammunition with high-BC bullets will consistently deliver the best accuracy. For hunting, select cartridges with appropriate bullet construction for the intended game.
• Sling: A high-quality sling is essential for carrying the rifle comfortably and can also aid in stability when shooting from unsupported positions.
• Maintenance Kit: Regular cleaning and maintenance are vital for preserving the rifle's accuracy and reliability. Invest in a good cleaning kit specifically designed for AR-15 platforms.
• Rangefinder: Accurately determining target distance is critical for long-range hits. A reliable laser rangefinder will be an invaluable tool.
• Wind Meter: Understanding environmental factors like wind speed and direction is crucial for precise long-range shooting. A Kestrel or similar device can provide invaluable data.

By investing in quality accessories and dedicating time to practice, you can maximize your precision and effectiveness with the CMMG Endeavor 300 MK4.

Why Choose the CMMG Endeavor 300 MK4 6mm ARC?

The CMMG Endeavor 300 MK4 6mm ARC rifle represents a significant advancement in AR-platform performance. It's a rifle built for discerning individuals who prioritize precision, reliability, and long-range capability. Its unique value proposition lies in the seamless integration of the ballistically superior 6mm ARC cartridge with CMMG's reputation for manufacturing robust and accurate firearms.

This rifle is more than just a collection of parts; it's a meticulously assembled system designed to deliver consistent, repeatable accuracy, shot after shot. From the advanced metallurgy of its barrel to the ergonomic adjustability of the Magpul PRS stock and the protective Titanium Cerakote finish, every element contributes to a superior shooting experience.

If you're ready to elevate your long-range shooting game, invest in a rifle that is truly engineered for performance. The CMMG Endeavor 300 MK4 in 6mm ARC is a top-tier choice that promises to exceed expectations and deliver exceptional results, whether on the competition circuit, in the field, or at the farthest reaches of the shooting range.

Availability

The CMMG Endeavor 300 MK4 6mm ARC rifle, along with a wide selection of firearms and accessories, is available at DEGuns. Visit deguns.com to explore this exceptional rifle and other premium shooting equipment.

Key Specifications: CMMG Endeavor 300 MK4 6mm ARC Rifle

Feature	Detail
Model	CMMG Endeavor 300 MK4
Caliber	6mm ARC
Barrel Length	20 Inches
Capacity	10+1 Rounds
Finish	Titanium Cerakote Receiver
Stock	Adjustable Magpul PRS Gen3 Stock
Platform	AR-15 (Direct Impingement)
Twist Rate	Optimized for 6mm ARC (e.g., 1:7.5")
Handguard	Free-Float M-LOK Compatible
UPC	815835019888