Unleash Unrivaled Precision: The CMMG Endeavor 300 MK4 6mm ARC Rifle in Sniper Gray

Are you searching for a high-performance AR-platform rifle that pushes the boundaries of long-range accuracy and versatility? Do you need a firearm capable of excelling in competitive shooting, precision hunting, or advanced tactical applications? The CMMG Endeavor 300 MK4 chambered in 6mm ARC is engineered precisely for individuals who demand exceptional ballistic performance, unwavering reliability, and superior modularity from their rifle. This comprehensive guide will explore why this rifle, featuring a 20-inch barrel, 10+1 capacity, striking Sniper Gray Cerakote finish, and an adjustable Magpul PRS Stock, stands out as a top-tier choice for serious shooters.

Engineered for Excellence: The CMMG Endeavor 300 MK4 Platform

The CMMG Endeavor series represents the pinnacle of modern sporting rifle design, built upon the incredibly versatile and widely trusted AR-15 platform. CMMG, a brand synonymous with innovation and quality in the firearms industry, meticulously crafts each Endeavor rifle to deliver an unparalleled shooting experience. The MK4 variant specifically utilizes the robust and adaptable AR-15 lower receiver, making it a familiar and highly customizable choice for enthusiasts.

What makes the Endeavor 300 MK4 so appealing for precision-focused tasks?

• Robust AR-15 Foundation: Leveraging the proven AR-15 architecture ensures a vast aftermarket for parts and accessories, allowing for extensive customization. This platform is renowned for its ergonomics and intuitive controls, facilitating rapid target engagement and comfortable extended shooting sessions.
• CMMG's Manufacturing Prowess: CMMG is known for its stringent quality control and advanced manufacturing techniques. Every component, from the barrel to the bolt carrier group, is held to exacting standards, ensuring consistent performance and a long service life. This commitment to quality translates directly into tighter groups downrange and reliable operation in diverse conditions.
• Optimized Gas System: For a rifle chambered in 6mm ARC, the gas system is critical for consistent cycling and felt recoil management. CMMG tunes the gas system on the Endeavor 300 MK4 to optimize the interaction between the gas port, gas block, and gas tube, ensuring reliable extraction and feeding with a wide range of ammunition. This attention to detail reduces wear on internal components and enhances the overall shooting experience.

The Heart of Precision: Unpacking the 6mm ARC Caliber

The 6mm ARC (Advanced Rifle Cartridge), developed by Hornady, has rapidly gained acclaim as a game-changer for AR-15 platform rifles. It was designed from the ground up to offer superior long-range ballistics, energy, and accuracy within the confines of the AR-15's shorter action, traditionally limited by larger cartridges.

Why is 6mm ARC the Ideal Choice for this Rifle?

• Exceptional Ballistic Coefficients: 6mm projectiles are inherently aerodynamic, boasting high ballistic coefficients (BCs). This means they retain velocity better, are less affected by wind drift, and deliver more energy on target at extended ranges compared to smaller calibers like 5.56 NATO or even some heavier alternatives.
• Reduced Recoil, Enhanced Control: Despite its impressive performance, the 6mm ARC generates significantly less recoil than larger cartridges like .308 Winchester or 6.5 Creedmoor. This lighter recoil allows shooters to maintain their sight picture, make faster follow-up shots, and endure longer training sessions without fatigue, directly leading to improved accuracy and confidence.
• Optimized for the AR-15: The 6mm ARC was specifically engineered to operate flawlessly within the AR-15 magazine well and bolt face, maximizing the platform's potential without requiring major modifications. This seamless integration ensures reliability and allows for standard AR-15 parts compatibility for most components.
• Versatile Applications: The 6mm ARC cartridge offers a sweet spot of versatility. Its flat trajectory and potent energy delivery make it highly effective for precision target shooting, competitive gas gun matches, and hunting medium-sized game.

When you're asking, "What is the best caliber for long-range shooting in an AR-15?" or "How can I get more range out of my AR-style rifle?", the 6mm ARC is consistently a top recommendation, and the CMMG Endeavor 300 MK4 is built to fully exploit its capabilities.

The Role of the 20-Inch Barrel

The 20-inch barrel length on the CMMG Endeavor 300 MK4 is a critical factor in unlocking the full potential of the 6mm ARC.

• Maximum Velocity: A longer barrel allows the propellant gasses to act upon the projectile for an extended period, maximizing muzzle velocity. For the 6mm ARC, this translates to flatter trajectories and increased effective range.
• Enhanced Accuracy: Longer barrels generally provide a longer sight radius (when using iron sights) and can contribute to improved harmonic stability, which helps in achieving superior accuracy, especially important for precision shooting disciplines.
• Optimal Performance: Many factory 6mm ARC ammunition loads are specifically developed and tested with 20-inch or similar barrel lengths to achieve their advertised ballistic performance. This ensures you're getting the most out of your ammunition.

Unwavering Stability: The Adjustable Magpul PRS Stock

For any precision rifle, the stock is just as vital as the barrel and action. The Magpul PRS (Precision Rifle/Sniper) Gen3 Stock included with the CMMG Endeavor 300 MK4 is widely regarded as one of the best adjustable stocks available for the AR platform. Its inclusion signifies that this rifle is designed for serious precision work.

Key Benefits of the Magpul PRS Stock:

• Unparalleled Adjustability: The PRS stock offers tool-less, incremental adjustments for both comb height (cheek weld) and length of pull (LOP). This extensive adjustability allows shooters of all sizes and shooting styles to achieve a perfect, repeatable fit, which is crucial for consistent accuracy and comfort.
• Enhanced Stability: Constructed from durable polymer and aluminum, the PRS stock is robust and provides a stable interface between the shooter and the rifle. Its wide buttpad distributes recoil effectively, further aiding in control and comfort during extended firing sessions.
• Optimized for Precision Shooting: The stock features multiple sling attachment points, including a QD socket and a 1.25" sling loop. It also includes an integral bottom M-LOK slot for attaching monopods or other accessories, offering even greater stability for bench rest or prone shooting.
• Reduces Shooter Fatigue: A properly fitted and stable stock minimizes muscle strain and fatigue, allowing you to maintain focus and precision for longer periods, whether during a competitive match or a full day at the range.

If you're asking, "What stock should I put on my precision AR-15?" or "How do I make my AR-15 more stable for long-range shots?", the Magpul PRS is an immediate and highly effective answer, and its direct integration on this CMMG rifle is a significant advantage.

Durability Meets Aesthetics: The Sniper Gray Cerakote Finish

The CMMG Endeavor 300 MK4 features a distinctive Sniper Gray Cerakote finish on its receiver. Cerakote is a polymer-ceramic composite coating known for its exceptional protective qualities and appealing aesthetics.

Advantages of Cerakote:

• Superior Corrosion Resistance: Cerakote provides a robust barrier against rust, moisture, and harsh environmental elements, making the rifle ideal for use in various climates and conditions. This is particularly important for firearms that may be exposed to the elements during hunting or tactical operations.
• Enhanced Abrasion and Wear Resistance: The ceramic properties of Cerakote make it incredibly resistant to scratches, chips, and general wear and tear from handling, transport, and use. This ensures your rifle maintains its pristine appearance and protective coating for years to come.
• Chemical Resistance: Cerakote is highly resistant to many common cleaning solvents and chemicals, simplifying maintenance and preserving the finish.
• Distinctive Appearance: The Sniper Gray Cerakote gives the rifle a modern, tactical, and sophisticated look that stands out from standard black finishes. It's not just about protection; it's about making a statement.

For those wondering, "How can I protect my rifle from the elements?" or "What's the most durable finish for a firearm?", Cerakote is a widely recommended solution, and CMMG's choice of Sniper Gray adds a professional touch to this high-performance package.

Reliable Capacity: The 10+1 Magazine

The CMMG Endeavor 300 MK4 comes with a 10+1 round capacity. While AR-15 platforms often support higher capacities, a 10-round magazine is widely accepted and often preferred for specific scenarios.

• Compliance with Regulations: Many jurisdictions have limitations on magazine capacity. A 10-round magazine ensures broader legal compliance, making this rifle accessible to more shooters.
• Precision Shooting and Hunting: For long-range target shooting and hunting, a 10-round capacity is often more than sufficient. It promotes deliberate shot placement and reduces the bulk and weight associated with higher-capacity magazines, especially when shooting from a bipod or bag.
• Reduced Profile: A 10-round magazine has a lower profile, which can be advantageous when shooting prone or from a bench, as it keeps the magazine from interfering with the ground or rest.

Real-World Applications: Where the CMMG Endeavor 300 MK4 Shines

The combination of the 6mm ARC caliber, the CMMG Endeavor platform, and the premium components like the Magpul PRS stock makes this rifle exceptionally versatile for several demanding applications.

1. Long-Range Target Shooting

• The Challenge: Achieving consistent accuracy at distances beyond 500 yards, where wind drift and bullet drop become significant factors.
• How this Rifle Solves It: The 6mm ARC's superior ballistic coefficients minimize wind deflection and maintain energy, allowing for flatter trajectories. The 20-inch barrel maximizes velocity, and the Magpul PRS stock provides the stability needed for precise shot placement. The reduced recoil allows shooters to spot their own impacts and make rapid corrections.
• Keywords: Precision rifle, long-range accuracy, target shooting, ballistic performance, wind drift, bullet drop compensation.

2. Competitive Shooting (e.g., PRS Gas Gun Series)

• The Challenge: Engaging multiple targets at varying distances under time pressure, often from unconventional positions, requiring rapid follow-up shots and quick target transitions.
• How this Rifle Solves It: The AR-15 platform's inherent ergonomics and intuitive controls facilitate fast operation. The 6mm ARC's low recoil and excellent ballistics make it forgiving for dynamic engagements. The adjustable Magpul PRS stock allows shooters to quickly adapt to different shooting positions, maintaining a stable platform.
• Keywords: Competitive shooting, PRS (Precision Rifle Series), NRL (National Rifle League), gas gun, fast target acquisition, multi-target engagement.

3. Precision Hunting

• The Challenge: Ethical and effective harvesting of medium-sized game (e.g., deer, hogs, varmints) at various ranges, often requiring a single, well-placed shot.
• How this Rifle Solves It: The 6mm ARC delivers sufficient energy for ethical kills on medium game while maintaining a flat trajectory that simplifies range estimation. Its moderate recoil allows for quick follow-up shots if necessary, and the rifle's inherent accuracy ensures precise shot placement, minimizing animal suffering. The Sniper Gray Cerakote adds a layer of protection against the elements encountered in the field.
• Keywords: Hunting rifle, varmint hunting, deer hunting, hog hunting, ethical harvest, hunting accuracy, field conditions.

4. Tactical and Preparedness Applications

• The Challenge: Needing a reliable, accurate, and adaptable rifle for defensive purposes, training, or general preparedness scenarios.
• How this Rifle Solves It: The AR-15 platform is a trusted choice for tactical applications due to its modularity, reliability, and ease of use. The 6mm ARC offers a significant ballistic advantage over 5.56 NATO for engagements at extended distances, while the rifle's robust construction and Cerakote finish ensure durability in demanding environments.
• Keywords: Tactical rifle, defensive firearm, home defense, preparedness, reliable AR, versatile rifle.

Why Choose This CMMG Endeavor 300 MK4?

When you’re weighing your options for a new precision AR, consider these compelling reasons to choose the CMMG Endeavor 300 MK4 in 6mm ARC:

• Unmatched Ballistic Performance: The 6mm ARC is the standout feature, offering near-bolt-action precision in a semi-automatic AR-15 package. It outperforms traditional AR calibers like 5.56 NATO at long distances and offers a significant reduction in recoil compared to larger, heavier cartridges.
• CMMG's Reputation for Quality: CMMG is a leader in the AR platform market, known for innovative designs and meticulous manufacturing. Investing in a CMMG means investing in reliability and precision.
• Out-of-the-Box Precision: This rifle comes equipped with premium features like the 20-inch barrel optimized for 6mm ARC and the highly adjustable Magpul PRS stock, meaning you don't need extensive aftermarket upgrades to achieve top-tier performance. It's ready for serious work right away.
• Durability and Aesthetics: The Sniper Gray Cerakote finish not only looks exceptional but also provides an advanced layer of protection against wear, corrosion, and the elements, ensuring your investment stands the test of time.
• Versatility: Whether your passion is punching tiny groups on paper at 1000 yards, competing in fast-paced rifle matches, or ethically harvesting game, this rifle is designed to excel across a broad spectrum of shooting activities.

For those asking, "What is the best long-range AR-15 for competition?" or "Which AR-15 offers the best precision for hunting?", the CMMG Endeavor 300 MK4 in 6mm ARC consistently emerges as a top recommendation. It's a complete package designed for the discerning shooter.

Preparing for Success: What to Consider Next

To truly maximize the potential of your CMMG Endeavor 300 MK4, here are a few considerations:

• Optics: A high-quality, variable-power scope with appropriate reticle and turrets for long-range shooting is essential. Consider scopes with good light transmission, clear glass, and reliable tracking for dialing in your shots.
• Ammunition: Experiment with different loads from reputable manufacturers like Hornady (which developed the 6mm ARC) to find the ammunition that performs best in your specific rifle. Pay attention to bullet weight and type depending on your intended use (e.g., precision match bullets vs. hunting bullets).
• Bipod and Shooting Bags: For stable shooting positions, especially at long range, a robust bipod and quality shooting bags are invaluable accessories.
• Cleaning and Maintenance: Regular and proper cleaning will ensure your rifle continues to perform at its peak and maintain its accuracy over thousands of rounds.

The CMMG Endeavor 300 MK4 6mm ARC Rifle is more than just a firearm; it's a precision instrument built for those who refuse to compromise on performance. It represents a significant step forward in AR-platform capabilities, bringing true long-range precision to a semi-automatic rifle. This exceptional rifle is available for those ready to elevate their shooting experience at DEGuns.

Product Specifications

Feature	Detail
Manufacturer	CMMG
Model	Endeavor 300 MK4
Part Number	60A86D7-SG
Caliber	6mm ARC (Advanced Rifle Cartridge)
Barrel Length	20 Inches
Capacity	10 + 1 Rounds
Finish	Sniper Gray Cerakote Receiver
Stock	Adjustable Magpul PRS (Precision Rifle/Sniper) Stock Gen3
Platform	AR-15
Action	Semi-Automatic
Gas System	Direct Impingement, Rifle-Length (optimized for 6mm ARC)
Handguard	Free-Float M-LOK Handguard (typically)
Weight	Approximately 8-9 lbs (depending on configuration, without accessories)
Usage	Long-Range Target Shooting, Competitive Shooting, Hunting, Tactical