Out of stock
CMMG Resolute MK4 300BLK 16.1" Rifle - Armor Black Finish
$1,466.17
$1,549.95
(You save
$83.78
)
- Caliber-Gauge:
- 300 AAC Blackout/Whisper
- Finish-Color:
- Black
- Barrel Length:
- 16.1"
- Barrel Length Range:
- 16" to 16.99"
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.
Key Features
- 16.1" 4140CM SBN barrel with 1:7 twist optimized for subsonic and supersonic 300 Blackout ammunition
- Direct impingement operating system with carbine-length gas port for reliable semi-auto function
- CMMG ZEROED muzzle brake (5/8x24 threaded) for suppressor compatibility and recoil management
- EML15 M-LOK handguard with mounting points at 12, 3, 6, and 9 o'clock—lightweight and accessory-ready
- Ambidextrous controls: ZEROED charging handle, ambi safety selector (60/90 degree), and sling plate
- RipStock with integrated ambidextrous sling attachment for secure carry and setup
- ZEROED drop-in trigger for consistent break without gunsmithing
- Billet 6061-T6 upper, forged 7075-T6 lower for durability and accuracy
- Cerakote Armor Black finish resists corrosion and wear
- Includes 30-round Magpul PMAG
- Lightweight at 6.2 lbs—easy to carry and aim all day
Specifications
| 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 |
Frequently Asked Questions
Can I run a suppressor on the CMMG Resolute 300 Blackout?
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.
Is the CMMG Resolute ambidextrous?
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.
What ammunition does this rifle use?
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).
What's included in the box?
The rifle ships with a 30-round Magpul PMAG magazine and is fully assembled and ready to shoot.
How does the EML15 handguard compare to other AR15 handguards?
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.
Firearm Shipments:
To buy rifles or shotguns, you must be 18 years old, and for handguns, actions, or receivers, the minimum age is 21. By placing an order for this firearm, you confirm that you are the legitimate transferee/buyer, meet the legal age requirements, and comply with all Federal, State, and local laws and regulations necessary to purchase this firearm.
We only ship firearms to valid Federal Firearms License (FFL) holders. At checkout we provide a FFL locator for your convenience.
We will need a copy of the FFL’s license to facilitate the process, kindly request your dealer to email us a copy of their FFL, as we cannot dispatch the firearm until we receive this document. It is imperative for the buyer to choose their FFL dealer, ensure they are willing to facilitate the transfer, and have them email their FFL copy to BOSQUE Outdoors. To avoid any confusion, the customer's name or order number must be mentioned in the email containing the FFL.
Email: [email protected]
- Prior to placing an order, it is the buyer's responsibility to understand and adhere to their state's firearm regulations.
- The buyer should verify with their receiving dealer that the chosen firearm is legally permissible in their state.
- The buyer is accountable for any transfer fees or background check charges imposed by the receiving dealer. If the designated dealer declines to accept the firearm delivery, the buyer assumes responsibility for shipping costs to retrieve the firearm and resend it to an accommodating dealer.
- Handguns will be shipped using air transportation, while long guns can be shipped using ground methods. If your order includes a mix of firearm and non-firearm items, BOSQUE Outdoors will send the firearm(s) to your selected FFL dealer and the remaining non-firearm items to your billing address.
- Firearms cannot be returned to BOSQUE Outdoors; please contact the manufacturer for warranty claims.
- Firearms refused by the FFL Dealer or which cannot be transferred due to a failed background check are subject to a $75 restocking fee plus 10% of the purchase price.
