The CMMG Dissent Mk4 in .300 AAC Blackout (brand part no. 30A750AMB) is a semi-automatic rifle finished in Midnight Bronze, pairing a 16.1-inch barrel with a 1:7-inch twist tuned to run both subsonic and supersonic .300 Blackout loads. CMMG fits the DISSENT side-folding stock with an adjustable length of pull and cheek riser, and a forward non-reciprocating charging handle allows quick manipulation without breaking the sight picture. The M-LOK handguard carries a top Picatinny rail, and an adjustable gas block lets shooters fine-tune cycling for their preferred supersonic or subsonic ammunition, running a 60/90-degree CMMG ZEROED safety selector. Among AR-platform rifles in the AR rifles category, the Dissent Mk4 favors .300 Blackout shooters who want a compact, tunable, folding-stock build.

Key Specifications

• Chambered in .300 AAC Blackout with a 1:7-inch rate of twist.
• Features a 16.1-inch barrel.
• Fitted with a DISSENT side-folding stock, adjustable length of pull and cheek riser.
• Includes a forward non-reciprocating charging handle.
• Wrapped in an M-LOK handguard with a top Picatinny rail.
• Runs an adjustable gas block, tunable for supersonic or subsonic loads.
• Uses a 60/90-degree CMMG ZEROED safety selector.
• Finished in Midnight Bronze.
• Feeds from a magazine with a 30+1 capacity.

Frequently Asked Questions

Can the gas system be tuned? Yes, the adjustable gas block lets shooters fine-tune cycling for supersonic or subsonic .300 Blackout loads.

Does the stock fold? Yes, CMMG’s DISSENT side-folding stock adjusts for length of pull and cheek height.

Buy the CMMG Dissent Mk4 .300 AAC Blackout

A compact, tunable .300 Blackout rifle with a folding stock is exactly what the Dissent Mk4 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.