CMMG Dissent MK4 | .338 ARC | 10.50″ | 34A840F-AB

The CMMG DISSENT MK4 is a compact AR-style pistol chambered in .338 ARC designed to combine AR ergonomics with a large-bore cartridge. It uses CMMG’s Compact Action to house the recoil system in the upper receiver, eliminating the need for a buffer tube and improving portability. The 10.50″ black nitride threaded barrel and 9.60″ M-LOK handguard keep overall length low while maintaining accessory compatibility. A recommended optic for this platform is a Holosun HS503G red-dot or a similar rugged 1x red-dot priced well under $1000 for fast target acquisition.

Typical applications include short- to mid-range precision shooting and medium-game hunting where a compact, large-bore AR-format pistol offers advantages in maneuverability and ammunition versatility.

Product Specifications

• The model is Dissent.
• The manufacturer is CMMG.
• The manufacturer part number is 34A840F-AB.
• The caliber is .338 ARC.
• The action is Semi-Auto.
• The barrel measures 10.50″ and is described as a black nitride threaded barrel.
• The handguard measures 9.60″ and uses an M-LOK interface.
• The finish is Cerakote in Black Armor.
• The overall length is 18.70″.
• The weight is 4.90 lbs.
• The capacity is 10 + 1.
• The stock material is Polymer with a Black finish.
• The safety is a CMMG Zeroed 60/90 Degree.
• The grip is listed as CMMG Zeroed.
• The UPC is 840442506728.

The DISSENT MK4 offers a compact footprint without sacrificing the modularity shooters expect from an AR platform. The threaded 10.50″ barrel and M-LOK handguard support a wide range of muzzle devices and accessories while the Compact Action simplifies handling in a pistol configuration. For shooters seeking a portable AR-format option in .338 ARC, this configuration balances controllability and terminal performance for field use and precision work.

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