The CMMG Dissent Mk17 is a 9mm pistol-caliber carbine built on the AR-15 manual of arms, using Sig Sauer P320/M17/M18 magazines instead of AR-15 mags. It runs a 16.1-inch barrel with a 1:10 twist on a radial delayed blowback action, and it ships in a Cerakote Armor Black finish. The rear of the rifle carries a side-folding stock with adjustable length of pull and a cheek riser. 
 

Key Specifications 

• Brand: CMMG 
• Model: Dissent Mk17 
• Caliber: 9mm 
• Barrel Length: 16.1in 
• Capacity: 21 rounds 
• Weight: 6.7 lbs 
• Finish: Cerakote, Armor Black 
   

Detailed Features 

• 16.1-inch 4140CM SBN barrel, 1:10 twist, with a CMMG Zeroed muzzle brake 
• M-LOK handguard with a top Picatinny rail for optics and accessories 
• Non-reciprocating, reversible side charging handle for staying on target while cycling 
• Dissent side-folding stock with adjustable length of pull and cheek riser 
• Ships with two 21-round Sig Sauer P320-pattern magazines 
• Forged 7075 T6 aluminum upper and lower receivers with a Zeroed drop-in trigger

Owners of the CMMG Dissent Mk17 tend to like that it runs on the familiar AR-15 manual of arms while feeding from widely available Sig P320 magazines, which simplifies sourcing spare mags. The radial delayed blowback action gets generally positive marks for reliability once the rifle has cycled a few hundred rounds through it, though a handful of owners note it can run dirty compared to a locked-breech design.

Handling-wise, the side-folding stock with adjustable cheek riser is a frequent highlight for getting a consistent cheek weld with an optic mounted, and the non-reciprocating side charging handle is praised for letting shooters stay on target while manipulating the action. Some owners find the Dissent stock system adds a bit of bulk compared to a simpler fixed-stock PCC.

On value, buyers like that the 9mm chambering keeps ammo costs down for range time compared to running an AR-15 in 5.56, and the Mk17's compatibility with Sig P320 magazines opens up an already mature aftermarket. The common complaint is that Cerakote finish options and the folding stock hardware add cost relative to a bare-bones PCC build.