CMMG Resolute Mk4 5.56mm 16.1" Rifle - Armor Black Finish

The CMMG Resolute Mk4 5.56mm 16.1" rifle strikes a practical balance between the heft of a full-size platform and the compact handling of a shorter setup. Chambered in 5.56x45mm—the globe's most proven and accessible rifle cartridge—this carbine delivers reliable long-range ballistic performance without the weight penalty of a rifle-length gun. Whether you're building your first AR or rounding out a collection, the Resolute Mk4 5.56 is a no-nonsense choice that handles hunting, sport shooting, and training equally well.

Built on CMMG's Mk4 platform, this rifle accepts standard AR15 accessories, so you can customize it to fit your ergonomics and mission. The EML15 M-LOK handguard balances tactical modularity with a lighter profile than full-length Picatinny rails, offering M-LOK slots at the 3, 6, 9, and 12 o'clock positions for mounting optics, lights, and other essential gear. Inside, you'll find CMMG's ZEROED component suite—a matched set of trigger, muzzle brake, ambi charging handle, and controls designed to work together as a cohesive system. The direct impingement operating system is time-tested, easy to maintain, and runs cool and clean in extended shooting sessions.

At 6.4 lbs and 32.5" in overall length, the Resolute Mk4 5.56 is light enough to carry all day and compact enough to navigate tight quarters without sacrificing sight radius or velocity. It ships with a 30-round Magpul PMAG, a carbine-length buffer system, and CMMG's RipStock, giving you everything needed to get on target right out of the box. The armor black Cerakote finish resists corrosion in harsh conditions. This is a rifle that earns its keep whether you're hunting open country, running courses, or simply practicing solid fundamentals at the range.

Key Features

• 16.1" barrel chambered in 5.56x45mm with 1:7 twist for bullet compatibility and velocity
• Direct impingement system for proven reliability and easy field maintenance
• CMMG ZEROED muzzle brake (1/2x28 thread) for recoil management and flash control
• CMMG EML15 M-LOK handguard with four mounting positions for tactical accessories
• Mk4 platform accepts standard AR15 parts and aftermarket accessories
• Ambidextrous charging handle, safety selector (60/90°), and sling plate for southpaw shooters
• ZEROED drop-in trigger for consistent, predictable trigger breaks
• RipStock carbine-length stock for compact footprint and adjustability
• Armor black Cerakote finish for durability in field conditions
• Includes 30-round Magpul PMAG magazine

Specifications

Frequently Asked Questions

Is this rifle good for hunting?

Yes. The 5.56x45mm cartridge is used by hunters for varmint and medium game where applicable by local law. The 16.1" barrel provides sufficient velocity for effective range, and the lightweight, ergonomic design makes it easy to carry in the field or from a stand. Always verify caliber legality for your specific game and jurisdiction.

Can I add my own optics and accessories?

Absolutely. The Resolute Mk4 is built on CMMG's Mk4 platform and accepts standard AR15 accessories. The EML15 handguard has M-LOK slots at 3, 6, 9, and 12 o'clock positions for mounting lights, vertical grips, and other gear. The upper receiver is ready for any Picatinny rail-mounted scope or red dot, and the receiver extension includes an ambi sling plate for quick attachment.

What comes in the box?

The rifle ships with a 30-round Magpul PMAG magazine, the RipStock installed, and all CMMG ZEROED components assembled. You'll need to supply ammunition and choose your optic or sighting system separately.

Is this rifle good for left-handed shooters?

Yes. The ambidextrous charging handle, ambidextrous safety selector (60/90 degree), and ambi sling plate make it equally user-friendly for southpaw shooters. The controls are positioned for natural operation from either shoulder.