The Ultimate Guide to the CMMG Resolute MK4 5.56x45mm NATO Rifle: Your Versatile Modern Sporting Rifle

Are you searching for a reliable, highly customizable, and exceptionally versatile modern sporting rifle that excels in a multitude of scenarios? Do you want to understand what makes an AR-15 a true staple for any firearm collection, whether you're a seasoned enthusiast or considering your first rifle? Look no further than the CMMG Resolute MK4, chambered in the globally recognized 5.56x45mm NATO cartridge. This comprehensive guide will delve deep into the features, benefits, and real-world applications of this outstanding firearm, helping you decide if the CMMG Resolute MK4 is the ideal choice for your shooting needs.

Why the 5.56x45mm NATO Caliber is a Global Standard

When most people envision an AR-15, the dimensions and the prolific 5.56x45mm NATO caliber immediately come to mind. This CMMG Resolute rifle is precisely chambered in this cartridge, and for excellent reasons. The 5.56 NATO, along with its counterpart, the .223 Remington, has served with militaries, hunters, and recreational shooters for decades, earning a reputation for its balanced performance, widespread availability, and manageable recoil.

• Versatility: The 5.56x45mm NATO excels in diverse environments. Its high velocity and relatively flat trajectory make it suitable for target shooting at varying distances, while its proven terminal performance also renders it effective for small to medium game hunting, where regulations permit.
• Cost-Effectiveness & Availability: As one of the most common rifle calibers globally, 5.56x45mm NATO and .223 Remington ammunition are generally abundant and more economical than many other rifle cartridges, making regular practice and training more accessible.
• Performance Balance: It strikes an optimal balance between power, recoil, and accuracy. Shooters can engage targets quickly and effectively, making it a favorite for competitive shooting, tactical training, and defensive applications.

CMMG's Commitment to Excellence: Engineering the Resolute MK4

CMMG (Central Missouri Machine Gun) has built a solid reputation for producing high-quality, dependable firearms, and the Resolute line exemplifies this commitment. The CMMG Resolute MK4 is not just another AR-15; it's a meticulously engineered carbine designed for consistent performance, user adaptability, and long-term durability.

This rifle is built on CMMG’s robust Mk4 platform, renowned for its compatibility with virtually any and all AR-15 accessories. This means if you have a particular look in mind, or an existing AR accessory that fits your shooting style best, the Resolute MK4 provides the perfect foundation. From optics to lights, slings to foregrips, the possibilities for personalization are virtually limitless, allowing you to tailor the rifle precisely to your preferences and operational requirements.

When full-size rifles prove too unwieldy, and pistols or SBRs (Short-Barreled Rifles) don't offer the extended-range ballistic performance you require, the CMMG Resolute line of carbine-length rifles stands as the definitive answer. It masterfully bridges the gap, providing a compact, maneuverable platform without compromising on barrel length advantages or ballistic efficacy.

Key Features of the CMMG Resolute MK4: A Closer Look

The CMMG Resolute MK4 5.56x45mm NATO carbine is meticulously crafted with a suite of high-performance components, many of which are part of CMMG's proprietary ZEROED parts and accessories line. These elements work in concert to deliver an exceptional shooting experience.

Barrel Specifications and Performance

• Barrel Length: The 16.10-inch barrel is a sweet spot for the AR-15 platform. It offers an excellent balance of ballistic performance for the 5.56x45mm NATO cartridge, maintaining good velocity while keeping the rifle compact and maneuverable. It also avoids NFA regulations associated with shorter barrels.
• Barrel Material and Finish: Constructed from durable Chrome Moly Steel and treated with a Black Nitride finish, the barrel offers superior corrosion resistance and increased surface hardness compared to traditional phosphate finishes. This translates to a longer barrel life and easier cleaning.
• Twist Rate: Featuring a 1:7" twist rate, this barrel is optimally designed to stabilize a wide range of bullet weights, especially the heavier projectiles (62-77 grain) that are common in 5.56x45mm NATO ammunition. This ensures excellent accuracy, whether you're shooting M193 ball or precision match rounds.
• Muzzle Device: The inclusion of a compensator at the muzzle significantly reduces muzzle rise and felt recoil, allowing for faster follow-up shots and improved target re-acquisition, crucial for dynamic shooting scenarios.
• Thread Pattern: The standard 1/2"x28 thread pattern means the barrel is ready to accept a vast array of aftermarket muzzle devices, suppressors, or different compensators, providing further customization options.

Receiver and Finish: Durability Meets Aesthetics

• Receiver Material: Crafted from high-grade aluminum, the receiver is both lightweight and incredibly robust, designed to withstand the rigors of consistent use.
• Receiver Finish: The Black Cerakote finish is not just for aesthetics; it's a highly durable ceramic-based coating known for its exceptional resistance to abrasions, corrosion, and chemicals. This finish ensures your rifle looks great and performs reliably in harsh environments.
• Receiver Description: The upper receiver features a full-length Picatinny rail, allowing for easy and secure mounting of optics, iron sights, or other sighting systems.

The Innovative EML 15 Handguard

The new EML 15 handguard elevates the rifle's style and functionality. It features M-LOK attachment slots strategically placed at the 3, 6, and 9 o'clock positions, as well as an additional section on top at 12 o'clock.

• Weight Reduction: By omitting a full-length Picatinny section on top, the EML 15 handguard significantly reduces the overall weight of the rifle without sacrificing accessory mounting capability.
• Versatile Mounting: M-LOK is a popular and secure direct-attachment system for accessories, offering a sleek profile and allowing shooters to mount lights, lasers, foregrips, bipods, and other "must-have" accessories precisely where needed.

Ergonomics and Control: ZEROED Parts and the RIPSTOCK

The CMMG Resolute MK4 is fitted with the complete suite of ZEROED parts and accessories, designed to enhance user experience and operational efficiency. These include:

• Ambidextrous Safety Lever: This critical feature allows for effortless manipulation of the safety from either side of the rifle, catering to both right- and left-handed shooters, and enhancing overall gun handling.
• Single-Stage Trigger: A clean, crisp single-stage trigger provides a predictable break, which is essential for accuracy and consistent shot placement.
• CMMG 6 Position RipBrace & RIPSTOCK: The legendary RIPSTOCK (or RipBrace, depending on configuration and local regulations) is a standout feature. This proprietary CMMG design allows for rapid deployment and adjustment through six positions, providing quick and precise length-of-pull customization. Its synthetic material contributes to the rifle's overall light weight.
• Black Polymer Grip: The comfortable black polymer grip ensures a secure hold, even in adverse conditions, contributing to better control and reduced shooter fatigue.

Operating System and Capacity

• Direct Impingement: The rifle utilizes a direct impingement operating system, a tried-and-true design known for its simplicity and accuracy. This system directs gas directly from the barrel to cycle the bolt carrier group.
• Capacity: With a 30+1 capacity, the rifle comes with a standard AR-15 magazine, offering ample firepower for various applications. It can accept a wide range of AR-15 type magazines, from standard capacity to extended options.

What Problems Does the CMMG Resolute MK4 Solve?

The CMMG Resolute MK4 5.56x45mm NATO rifle is designed to be the go-to solution for a wide array of shooting needs, making it an indispensable addition to any firearm enthusiast's collection.

• "What is the best AR-15 for a new shooter or first-time rifle owner?"

The Resolute MK4, with its manageable 5.56/.223 caliber, ergonomic design, and intuitive controls, makes it an excellent choice for those new to the AR-15 platform. Its inherent reliability and ease of customization allow new shooters to grow with the rifle.

• "I need a versatile carbine for both range practice and home defense. What do you recommend?"

Its 16.10-inch barrel provides the necessary ballistic performance for range accuracy, while its compact size and high capacity make it highly effective for home defense scenarios. The ambidextrous safety and quick-adjust RipBrace enhance its utility in dynamic situations.

• "Where can I find a durable and customizable AR-15 for various shooting activities?"

The CMMG Resolute MK4's robust Cerakote finish, Black Nitride barrel, and Mk4 platform compatibility ensure longevity and endless customization possibilities. Whether for plinking, competitive shooting, or tactical training, it adapts effortlessly.

• "How can I bridge the gap between a full-sized rifle and a pistol/SBR in terms of performance and maneuverability?"

The Resolute line is precisely engineered to fill this void. It offers superior ballistic performance compared to shorter firearms, while remaining far more maneuverable and less cumbersome than traditional full-size rifles, especially in tighter spaces or for quicker transitions.

• "I'm looking for a modern sporting rifle that handles well and is comfortable to shoot."

Weighing just 5.90 lbs and boasting an OAL of 26", the Resolute MK4 is exceptionally lightweight and well-balanced. The CMMG 6 Position RipBrace allows for perfect length-of-pull adjustment, ensuring optimal comfort and control for any shooter.

Optimizing Your CMMG Resolute MK4: Accessories and Maintenance

Part of the appeal of the AR-15 platform, and specifically the CMMG Resolute MK4, is its incredible modularity. Since the rifle does not come with sights, your first step will likely be selecting an optic that suits your shooting style, whether that's a red dot sight for close quarters, a low-power variable optic (LPVO) for versatility, or a magnified scope for precision shooting.

• Optics: Choose from a wide array of red dots, holographic sights, LPVOs, or traditional scopes. The Picatinny rail on the upper receiver provides a stable mounting platform.
• Lights & Lasers: Utilize the M-LOK slots on the EML 15 handguard to attach tactical lights for low-light conditions or laser aiming devices for rapid target acquisition.
• Foregrips: Vertical or angled foregrips can be mounted via M-LOK, enhancing control and comfort during sustained shooting.
• Slings: A quality sling is essential for rifle retention and hands-free carry.
• Magazines: Explore different capacities and brands of AR-15 magazines to suit your needs.

Maintaining your CMMG Resolute MK4 is straightforward. Regular cleaning of the barrel, bolt carrier group, and trigger assembly will ensure consistent reliability and accuracy. The Black Nitride barrel finish and Cerakote receiver enhance durability, reducing the need for extensive exterior maintenance. Always refer to the owner's manual for detailed cleaning and safety instructions.

Availability and Trust: Where to Find Your CMMG Resolute MK4

The CMMG Resolute MK4 5.56x45mm NATO rifle is a testament to CMMG's commitment to quality, performance, and shooter satisfaction. Its blend of traditional AR-15 strengths with innovative CMMG-specific enhancements like the ZEROED parts and the RIPSTOCK makes it a compelling choice for anyone in the market for a top-tier modern sporting rifle.

These exceptional CMMG products, including the Resolute MK4, are available at DEGuns. With a commitment to providing a wide selection of firearms and accessories, DEGuns is a trusted source for your shooting needs.

Don't just take our word for it; see the CMMG Resolute MK4 in action:

Whether you're looking to upgrade your collection, acquire your first reliable AR-15, or seeking a versatile platform for diverse shooting disciplines, the CMMG Resolute MK4 5.56x45mm NATO rifle stands ready to exceed your expectations. Its proven design, robust construction, and adaptable features make it a rifle that is truly never out of place.

CMMG Resolute MK4 5.56x45mm NATO Specifications

Feature	Detail
Brand	CMMG
Model	Resolute MK4
Caliber	5.56x45mm NATO
Barrel Length	16.10"
Capacity	30+1
Operating System	Direct Impingement
Hand	Right Hand
Weight	5.90 lbs
Overall Length	26"
Barrel Material	Chrome Moly Steel
Barrel Finish	Black Nitride
Barrel Twist	1:7"
Muzzle Device	Compensator
Thread Pattern	1/2"x28
Receiver Finish	Black Cerakote
Receiver Material	Aluminum
Handguards	M-LOK (EML 15)
Stock/Brace	CMMG 6 Position RipBrace
Stock Material	Synthetic
Grips	Black Polymer
Safety	Ambidextrous Lever
Trigger	Single-Stage
Sights	None (Optics Ready)
Magazine Type	AR-15
Gun Platform	AR-Style
UPC	810046238622