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PRODUCT #91A2587

Resolute 300 Rifle
Mk9, 9mm, 9mm RDB, 9mm (Colt)

$1,699.95

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$1,699.95

CMMG is temporarily halting the sale of complete firearms, upper receiver groups, lower receiver groups, and Radial Delayed Blowback BCG kits on our website in order to focus on outstanding orders. We apologize for the inconvenience and appreciate your patience as we traverse this extremely busy time. Sign up for notifications on your favorite products to get notified when they become available again or find a local dealer on our dealer page.

Rifle, Resolute 300, Mk9, 9mm Radial Delayed Blowback™

As CMMG’s oldest 9mm platform, the Mk9 is continuing to go through changes to become even better than before. Introducing, the new and improved Mk9, now utilizing CMMG’s patented Radial Delayed Blowback™ operating system. Radial Delayed Blowback guarantees less felt recoil for the shooter, offering a more enjoyable shooting experience.  Our Mk9 platform is designed to use Colt SMG-style magazines and is offered in both BANSHEE and RESOLUTE configurations.    

If you want the best an AR has to offer, then the 300 Series is your choice. This AR is fitted with every desired feature including a choice of 10 Premier Cerakote colors, laser engraved model name on the lower receiver, updated ambidextrous controls and sling points along with a premium trigger, Magpul grip, CMMG RIPSTOCK, and CMMG SV muzzle brake. These are just a few of the possible upgrades on this series. Chambered in 9mm, this AR is ready for the range. 


CMMG’s RESOLUTE rifle and carbine lineup is engineered with purpose for those who refuse to compromise on quality. Each RESOLUTE rifle is designed for balance, accuracy and maneuverability. Available in three tiers —RESOLUTE 100, RESOLUTE 200 and RESOLUTE 300 — that cater to your intended needs and customization. Whether you’re defending your family or looking to bring out your best at the range, the RESOLUTE keeps going when you need it most.

CMMG has made a small modification to 9mm barrels in order for them to be compatible with Mk9 lower receivers. This modification only applies to Mk9 platform lower receivers and does not positively or negatively affect functionality of the barrel with a MkGs, Mk4 or Mk17 platform lower receiver. Barrels that are stamped “9mm Luger” will be compatible with an upgraded Mk9 lower receiver. If your barrel is marked “9x19 NATO”, you will need to purchase a new 9mm barrel in order to ensure reliable function.

All CMMG products come with our Lifetime Quality Guarantee

Technical Specifications

Platform Mk9
Caliber 9mm, 9mm RDB, 9mm (Colt)
Operating System Radial Delayed Blowback
Barrel Length 16.1
Barrel Twist 1:10
Barrel Contour MT
Barrel Material 4140CM, SBN
Barrel Twist 1:10
Muzzle Device Compensator SV Brake
Muzzle Thread 1/2 X 28
Gas Port Location N/A
Gas Block N/A
Upper Receiver Forged 7075-T6 AL M4 type upper
Lower Receiver AR15 type lower with Colt patterned magwell
Hand Guard CMMG RML15 M-LOK
Finish Cerakote Standard
Charging Handle CMMG ZEROED Ambi Charging Handle AR15
Pistol Grip Magpul MOE
Receiver Extension 6 Position Enhanced Receiver Extension & Ambi Sling Plate
Stock / Brace CMMG RipStock
Trigger Type Geissele Automatics SSA 2-Stage
Trigger Guard Magpul MOE
Safety Selector Ambi
Magazine ASC 32rd
Weight 6.5

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