$1,466.17
Availability: In Stock
Current Stock: Out of stock
The CMMG Resolute MK4 300BLK 16.1" rifle bridges the gap between compact handling and serious ballistic capability. Built on the proven Mk4 AR platform, this 300 Blackout carbine excels whether you're running subsonic loads through a suppressor for quiet operation or pushing supersonic rounds downrange for extended reach. At 6.2 lbs and 32.5" overall, it's light enough to handle all day but delivers rifle-caliber performance where pistol-length guns run out of steam. The Armor Black Cerakote finish resists the elements, making it equally at home in a truck, at the range, or in the field.
The heart of the Resolute is its 16.1" barrel with a 1:7 twist rate optimized for the full spectrum of 300 Blackout loads, from heavy subsonic pills to zippy supersonic ammo. The 4140CM SBN barrel feeds into a direct impingement system with a carbine-length gas port and non-adjustable 0.750" gas block—simple, reliable, and proven. A CMMG ZEROED muzzle brake is threaded 5/8x24 for suppressor mounting or to manage recoil in open-air shooting.
Where modularity matters, CMMG equipped the Resolute with their EML15 M-LOK handguard, mounting slots at 3, 6, 9, and 12 o'clock keep weight down while giving you real estate for lights, lasers, and grips. The complete ZEROED parts suite—ambi charging handle, ambi safety, trigger guard, and 60/90-degree safety selector—keeps the rifle responsive and shooter-friendly whether you're right- or left-handed. A drop-in ZEROED trigger, RipStock with integrated sling attachment, and forged 7075 aluminum lower receiver round out a no-compromise platform. A 30-round Magpul PMAG ships loaded and ready.
This is a rifle for hunters who want subsonic stealth, shooters building a versatile modern carbine, and anyone after a lightweight intermediate-cartridge option that refuses to compromise on quality or ergonomics.
| Caliber | .300 Blackout |
| Platform | CMMG Mk4-AR15 |
| Barrel Length | 16.1" |
| Barrel Twist | 1:7 |
| Barrel Material | 4140CM SBN |
| Barrel Contour | MT |
| Operating System | Direct Impingement |
| Gas Port | Carbine length |
| Gas Block | 0.750" non-adjustable |
| Muzzle Device | CMMG ZEROED Muzzle Brake |
| Muzzle Thread | 5/8x24 |
| Upper Receiver | Billet 6061-T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075-T6 Aluminum |
| Handguard | CMMG EML15 M-LOK |
| Charging Handle | CMMG ZEROED Ambidextrous |
| Trigger | ZEROED Drop-In |
| Trigger Guard | CMMG ZEROED |
| Safety Selector | CMMG ZEROED 60/90 Degree Ambi |
| Stock/Brace | CMMG RipStock w/ Ambi Sling Plate |
| Buffer Type | Carbine |
| Receiver Extension | CMMG 6 Position Fastback w/ Ambi Sling Plate |
| Grip | CMMG ZEROED Pistol Grip |
| Magazine Included | Magpul 30-round PMAG |
| Finish | Cerakote Armor Black |
| Length (OAL) | 32.5" |
| Weight | 6.2 lbs |
Yes. The rifle ships with a CMMG ZEROED muzzle brake threaded 5/8x24, which is the standard for 300 Blackout suppressors. Unscrew the muzzle brake and thread on your suppressor. The carbine-length gas system and non-adjustable gas block are designed to run both subsonic and supersonic loads, making this an excellent suppressed rifle platform.
Yes. The Resolute features an ambidextrous charging handle, a 60/90-degree ambi safety selector, and an ambidextrous sling plate on the RipStock. Left- and right-handed shooters will find this rifle equally accessible.
The CMMG Resolute MK4 is chambered in .300 Blackout. It is optimized with a 1:7 barrel twist for the full range of 300 Blackout ammunition, including subsonic loads (typically 220+ grains) and supersonic loads (typically 110–150 grains).
The rifle ships with a 30-round Magpul PMAG magazine and is fully assembled and ready to shoot.
The CMMG EML15 is a lightweight M-LOK handguard with mounting points at 12, 3, 6, and 9 o'clock. Unlike some handguards with full-length Picatinny rails, the EML15 omits a continuous top rail in favor of dedicated M-LOK slots, reducing weight while maintaining accessory mounting versatility.
SKU: 120918253 • Weight: 7oz
Availability: In Stock
Current Stock: Out of stock
The CMMG Resolute MK4 300BLK 16.1" rifle bridges the gap between compact handling and serious ballistic capability. Built on the proven Mk4 AR platform, this 300 Blackout carbine excels whether you're running subsonic loads through a suppressor for quiet operation or pushing supersonic rounds downrange for extended reach. At 6.2 lbs and 32.5" overall, it's light enough to handle all day but delivers rifle-caliber performance where pistol-length guns run out of steam. The Armor Black Cerakote finish resists the elements, making it equally at home in a truck, at the range, or in the field.
The heart of the Resolute is its 16.1" barrel with a 1:7 twist rate optimized for the full spectrum of 300 Blackout loads, from heavy subsonic pills to zippy supersonic ammo. The 4140CM SBN barrel feeds into a direct impingement system with a carbine-length gas port and non-adjustable 0.750" gas block—simple, reliable, and proven. A CMMG ZEROED muzzle brake is threaded 5/8x24 for suppressor mounting or to manage recoil in open-air shooting.
Where modularity matters, CMMG equipped the Resolute with their EML15 M-LOK handguard, mounting slots at 3, 6, 9, and 12 o'clock keep weight down while giving you real estate for lights, lasers, and grips. The complete ZEROED parts suite—ambi charging handle, ambi safety, trigger guard, and 60/90-degree safety selector—keeps the rifle responsive and shooter-friendly whether you're right- or left-handed. A drop-in ZEROED trigger, RipStock with integrated sling attachment, and forged 7075 aluminum lower receiver round out a no-compromise platform. A 30-round Magpul PMAG ships loaded and ready.
This is a rifle for hunters who want subsonic stealth, shooters building a versatile modern carbine, and anyone after a lightweight intermediate-cartridge option that refuses to compromise on quality or ergonomics.
| Caliber | .300 Blackout |
| Platform | CMMG Mk4-AR15 |
| Barrel Length | 16.1" |
| Barrel Twist | 1:7 |
| Barrel Material | 4140CM SBN |
| Barrel Contour | MT |
| Operating System | Direct Impingement |
| Gas Port | Carbine length |
| Gas Block | 0.750" non-adjustable |
| Muzzle Device | CMMG ZEROED Muzzle Brake |
| Muzzle Thread | 5/8x24 |
| Upper Receiver | Billet 6061-T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075-T6 Aluminum |
| Handguard | CMMG EML15 M-LOK |
| Charging Handle | CMMG ZEROED Ambidextrous |
| Trigger | ZEROED Drop-In |
| Trigger Guard | CMMG ZEROED |
| Safety Selector | CMMG ZEROED 60/90 Degree Ambi |
| Stock/Brace | CMMG RipStock w/ Ambi Sling Plate |
| Buffer Type | Carbine |
| Receiver Extension | CMMG 6 Position Fastback w/ Ambi Sling Plate |
| Grip | CMMG ZEROED Pistol Grip |
| Magazine Included | Magpul 30-round PMAG |
| Finish | Cerakote Armor Black |
| Length (OAL) | 32.5" |
| Weight | 6.2 lbs |
Yes. The rifle ships with a CMMG ZEROED muzzle brake threaded 5/8x24, which is the standard for 300 Blackout suppressors. Unscrew the muzzle brake and thread on your suppressor. The carbine-length gas system and non-adjustable gas block are designed to run both subsonic and supersonic loads, making this an excellent suppressed rifle platform.
Yes. The Resolute features an ambidextrous charging handle, a 60/90-degree ambi safety selector, and an ambidextrous sling plate on the RipStock. Left- and right-handed shooters will find this rifle equally accessible.
The CMMG Resolute MK4 is chambered in .300 Blackout. It is optimized with a 1:7 barrel twist for the full range of 300 Blackout ammunition, including subsonic loads (typically 220+ grains) and supersonic loads (typically 110–150 grains).
The rifle ships with a 30-round Magpul PMAG magazine and is fully assembled and ready to shoot.
The CMMG EML15 is a lightweight M-LOK handguard with mounting points at 12, 3, 6, and 9 o'clock. Unlike some handguards with full-length Picatinny rails, the EML15 omits a continuous top rail in favor of dedicated M-LOK slots, reducing weight while maintaining accessory mounting versatility.
SKU: 120918253 • Weight: 7oz