CMMG 99B80E4AB Dissent | 9mm | 10.50 in Upper

The CMMG DISSENT 9mm upper group is a compact upper built around CMMG’s Compact Action and radial delayed blowback design. The complete action and recoil assembly are housed in the upper receiver to reduce bulk and overall length compared with traditional AR pistol-style uppers. A forward non-reciprocating left-side charging handle permits quick bolt operation while maintaining sight picture. The upper includes a 1913 Picatinny rail end plate intended to be used in place of a lower receiver buffer tube.

Typical applications include pistol-caliber carbine competition and compact range or training rigs where a shortened AR-platform upper is desired.

Product Specifications

• The manufacturer is CMMG.
• The model and part number is 99B80E4AB Dissent.
• The caliber is 9mm Luger.
• The barrel measures 10.50 inches.
• The barrel finish is Black.
• The rifling twist rate is 1:10.
• The handguard is a 9.60-inch M-LOK design.
• The handguard finish is Armor Black.
• The overall finish type is Armor Black.
• The charging handle is located on the left side and is non-reciprocating.
• The action operates using radial delayed blowback technology with a fixed ejector.
• The muzzle device is a zeroed linear compensator.
• The package includes a 1913 Picatinny rail end plate to use in place of a buffer tube.
• This upper is designed to fit AR-platform lowers.
• The UPC is 810097509856.

Engineered to reduce length without sacrificing the practical layout of an AR-platform upper, the DISSENT is a choice for shooters who want a compact, mechanically distinct 9mm upper for competition or tight-range training. Its left-side charging handle and integrated compact action keep operation straightforward while the M-LOK handguard and Picatinny end plate allow familiar accessory layouts.