CMMG DISSENT Mk4 SBR | .300 BLK | 6.5″

The CMMG DISSENT Mk4 is a compact SBR built around CMMG’s Compact Action, which houses the recoil system in the upper receiver to eliminate the buffer tube. Chambered in .300 BLK with a 6.5″ barrel, this platform is designed for portability, modularity and ambidextrous operation. The DISSENT includes a folding stock, adjustable gas block and a top Picatinny rail for optics and accessories. For a durable optic under $1000 that pairs well with this carbine-length setup, consider the Vortex Strike Eagle 1-6×24 for fast, versatile target acquisition.

Recommended real-world uses include suppressed precision at short ranges and a compact pack or vehicle-compatible patrol carbine for professional or recreational shooters.

Product Specifications

• The platform is Mk4.
• The caliber is .300 BLK.
• The barrel measures 6.5″ as listed.
• The barrel twist is 1:7.
• The barrel material is listed as 4140CM, SBN.
• The muzzle device is a CMMG ZEROED Linear Compensator.
• The muzzle is threaded 5/8 x 24.
• The gas system is located at the pistol position and the gas block is an adjustable 0.750″.
• The upper receiver is DISSENT 7075 T6 Aluminum.
• The lower receiver is Mk4 Forged 7075 T6 Aluminum.
• The handguard is a CMMG 5.5″ Proprietary design with M-LOK and a top Picatinny rail.
• The finish is Cerakote in Armor Black.
• The charging handle is a Dissent Side Charger – Reversible.
• The magazines included are Magpul 300BLK 30rd PMAG (2).
• The UPC is 810144720579, the listed weight is 5.6 lbs and the overall length is 16.5″ – 26″.

The DISSENT Mk4 condenses AR-style ergonomics into a highly portable SBR package while retaining modular mounting options and user-adjustable gas settings for varied .300 BLK loads. Its folding stock and reversible side charging handle make it well suited to tight spaces or rapid transitions, and the included PMAGs provide established feeding reliability. For shooters seeking a compact, adaptable carbine that accepts common AR accessories, the DISSENT presents a considered balance of features and quality materials.

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