The CMMG Resolute MK17 is a semi-automatic 9mm Luger carbine built on an AR-style platform with a 16.1-inch barrel and 21-round capacity. The receivers are 7075 T6 aluminum and the package ships with a Geissele SSA two-stage trigger and an M-LOK handguard — both well above the baseline for this price class. 
 

Key Specifications 

• Caliber: 9mm Luger (9x19 Para) 
• Barrel Length: 16.1 inches 
• Capacity: 21 rounds 
• Weight: 6.7 lbs 
• Action Type: Semi-Automatic 
• Finish Color: Black 
• Manufacturer: CMMG 
• Model Number: Resolute MK17 
   

Detailed Features 

The Geissele SSA two-stage trigger has a well-defined wall and a clean break — it's the component that most separates this carbine from budget PCCs. M-LOK handguards keep weight down while leaving room for lights, grips, and other accessories. The CMMG SV muzzle brake manages 9mm recoil effectively. The rifle is optic-ready with no iron sights included, so you'll need to plan for a mount and optic. The MK17 designation refers to compatibility with SIG P320 magazines. 
 

Usage 

At 6.7 lbs with a 16.1-inch barrel in 9mm, this is a practical carbine for home defense or competition use. The lower recoil of 9mm Luger compared to a rifle cartridge makes rapid follow-up shots easier to manage, and the 21-round capacity reduces time spent reloading. The AR ergonomics mean controls are familiar to anyone who has spent time on that platform. Three-gun and PCC competition shooters will find the Geissele trigger and M-LOK rail particularly useful starting points for a build.

The Resolute MK17 gets solid reviews from the PCC community, with the Geissele trigger drawing the most consistent praise — it's the feature that clearly separates this from a standard-trigger carbine.

Build quality is frequently noted as a strength. The 7075 T6 aluminum receivers and overall fit and finish hold up to scrutiny from buyers who've handled a range of AR-platform rifles.

Performance feedback is positive. Recoil in 9mm is already mild; the SV brake helps further, and the Geissele trigger makes accurate rapid fire accessible. Owners report good accuracy for a PCC and reliable cycling across common 9mm loads.

The 21-round capacity and P320 magazine compatibility come up often as practical advantages, particularly for competition use where magazine commonality matters.

Customization potential is part of the appeal — M-LOK handguards and the AR platform mean the accessory ecosystem is broad. Owners discuss optics, lights, and other additions frequently.

Price is the main point of debate. The MK17 sits at the higher end of the PCC market, and whether the Geissele trigger and CMMG build quality justify the premium over less expensive options is a recurring discussion. Most owners who've shot it conclude the trigger alone is worth a meaningful portion of the premium.