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CMMG
The CMMG Resolute Mk4 5.7x28mm rifle bridges a practical gap: it delivers rifle-length ballistics and accuracy in a compact, handy package that won't feel oversized for vehicle or home defense. Built on CMMG's proven Mk4 AR platform with radial delayed blowback operation, this 16.1\" barrel rifle in 5.7x28mm gives you serious velocity and energy downrange without the footprint or recoil of larger rifle calibers. The coyote tan cerakote finish blends durability with a purposeful look.
What sets the Resolute apart is thoughtful engineering: CMMG's proprietary magazines fit standard AR15 magwells, meaning you can leverage existing ammunition and accessories without learning an entirely new system. The EML15 M-LOK handguard strips unnecessary rail real estate to save weight while keeping attachment points where they matter—12, 3, 6, and 9 o'clock—so you can mount your optics, lights, or grips exactly how you need them. The rifle comes dressed with CMMG's full ZEROED suite: ambi charging handle, drop-in trigger, 60/90-degree safety, and matching trigger guard and grip. All that runs together on a 6-position fastback receiver extension with ambidextrous sling plate and the legendary RIPSTOCK for shooter control.
At 6.4 lbs and 32.5\" overall length, the Resolute Mk4 handles fast in tight spaces yet maintains the sight radius and energy of a proper carbine. The 1:9 barrel twist stabilizes the caliber, and the 1/2 x 28 muzzle threads accept a ZEROED muzzle brake for recoil management. A 32-round magazine ships with the rifle, giving you serious capacity without the bulk. This is a working rifle for shooters who want modular 5.7x28mm performance without compromise.
| Caliber | 5.7x28mm |
| Barrel Length | 16.1\" |
| Barrel Twist | 1:9 |
| Barrel Material | 4140CM with SBN (surgical black nitride) |
| Barrel Contour | MT |
| Operating System | Radial Delayed Blowback |
| Upper Receiver | Billet 6061 T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075 T6 Aluminum |
| Handguard | CMMG EML15 M-LOK |
| Charging Handle | CMMG ZEROED Ambi |
| Trigger | CMMG ZEROED Drop-In |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Trigger Guard | CMMG ZEROED |
| Pistol Grip | CMMG ZEROED |
| Stock/Brace | CMMG RIPSTOCK |
| Receiver Extension | CMMG 6 Position Fastback w/ Ambi Sling Plate |
| Buffer Type | Carbine |
| Muzzle Device | CMMG ZEROED Muzzle Brake |
| Muzzle Threads | 1/2 x 28 |
| Finish | Coyote Tan Cerakote |
| Magazine Capacity | 32 rounds (CMMG proprietary, fits AR15 magwells) |
| Overall Length | 32.5\" |
| Weight | 6.4 lbs |
| Platform | Mk4 |
No. The CMMG Resolute Mk4 5.7x28mm uses CMMG's proprietary 5.7x28mm magazines that fit standard AR15 magwells. This design maximizes modularity while being optimized for the 5.7x28mm cartridge. The rifle ships with a 32-round magazine.
The 16.1\" barrel length in a rifle platform delivers significantly more velocity, energy, and sight radius than a pistol-caliber firearm, giving you rifle-like ballistic performance in a compact, handy package. The 1:9 barrel twist is optimized for the 5.7x28mm cartridge.
The rifle ships with a 32-round CMMG proprietary magazine and is equipped with CMMG's complete ZEROED accessory suite, including ambi charging handle, drop-in trigger, ambi safety, pistol grip, trigger guard, muzzle brake, and RIPSTOCK receiver extension with ambidextrous sling plate.
Yes. The CMMG EML15 M-LOK handguard features M-LOK attachment slots at the 12, 3, 6, and 9 o'clock positions, giving you plenty of real estate to mount lights, laser devices, and other accessories. The design minimizes unnecessary rail while keeping mounting points where shooters need them.
CMMG
The CMMG Resolute Mk4 5.7x28mm rifle bridges a practical gap: it delivers rifle-length ballistics and accuracy in a compact, handy package that won't feel oversized for vehicle or home defense. Built on CMMG's proven Mk4 AR platform with radial delayed blowback operation, this 16.1\" barrel rifle in 5.7x28mm gives you serious velocity and energy downrange without the footprint or recoil of larger rifle calibers. The coyote tan cerakote finish blends durability with a purposeful look.
What sets the Resolute apart is thoughtful engineering: CMMG's proprietary magazines fit standard AR15 magwells, meaning you can leverage existing ammunition and accessories without learning an entirely new system. The EML15 M-LOK handguard strips unnecessary rail real estate to save weight while keeping attachment points where they matter—12, 3, 6, and 9 o'clock—so you can mount your optics, lights, or grips exactly how you need them. The rifle comes dressed with CMMG's full ZEROED suite: ambi charging handle, drop-in trigger, 60/90-degree safety, and matching trigger guard and grip. All that runs together on a 6-position fastback receiver extension with ambidextrous sling plate and the legendary RIPSTOCK for shooter control.
At 6.4 lbs and 32.5\" overall length, the Resolute Mk4 handles fast in tight spaces yet maintains the sight radius and energy of a proper carbine. The 1:9 barrel twist stabilizes the caliber, and the 1/2 x 28 muzzle threads accept a ZEROED muzzle brake for recoil management. A 32-round magazine ships with the rifle, giving you serious capacity without the bulk. This is a working rifle for shooters who want modular 5.7x28mm performance without compromise.
| Caliber | 5.7x28mm |
| Barrel Length | 16.1\" |
| Barrel Twist | 1:9 |
| Barrel Material | 4140CM with SBN (surgical black nitride) |
| Barrel Contour | MT |
| Operating System | Radial Delayed Blowback |
| Upper Receiver | Billet 6061 T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075 T6 Aluminum |
| Handguard | CMMG EML15 M-LOK |
| Charging Handle | CMMG ZEROED Ambi |
| Trigger | CMMG ZEROED Drop-In |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Trigger Guard | CMMG ZEROED |
| Pistol Grip | CMMG ZEROED |
| Stock/Brace | CMMG RIPSTOCK |
| Receiver Extension | CMMG 6 Position Fastback w/ Ambi Sling Plate |
| Buffer Type | Carbine |
| Muzzle Device | CMMG ZEROED Muzzle Brake |
| Muzzle Threads | 1/2 x 28 |
| Finish | Coyote Tan Cerakote |
| Magazine Capacity | 32 rounds (CMMG proprietary, fits AR15 magwells) |
| Overall Length | 32.5\" |
| Weight | 6.4 lbs |
| Platform | Mk4 |
No. The CMMG Resolute Mk4 5.7x28mm uses CMMG's proprietary 5.7x28mm magazines that fit standard AR15 magwells. This design maximizes modularity while being optimized for the 5.7x28mm cartridge. The rifle ships with a 32-round magazine.
The 16.1\" barrel length in a rifle platform delivers significantly more velocity, energy, and sight radius than a pistol-caliber firearm, giving you rifle-like ballistic performance in a compact, handy package. The 1:9 barrel twist is optimized for the 5.7x28mm cartridge.
The rifle ships with a 32-round CMMG proprietary magazine and is equipped with CMMG's complete ZEROED accessory suite, including ambi charging handle, drop-in trigger, ambi safety, pistol grip, trigger guard, muzzle brake, and RIPSTOCK receiver extension with ambidextrous sling plate.
Yes. The CMMG EML15 M-LOK handguard features M-LOK attachment slots at the 12, 3, 6, and 9 o'clock positions, giving you plenty of real estate to mount lights, laser devices, and other accessories. The design minimizes unnecessary rail while keeping mounting points where shooters need them.
