The CMMG Dissent Mk4 in 5.56mm NATO (brand part no. 55AC10B-AB) is CMMG’s shortest bufferless rifle chambered in one of the most common AR calibers, built around a 14.5-inch barrel fitted with a CMMG ZEROED SVD brake pinned and welded to bring the overall barrel length to 16.1 inches, eliminating the need for an NFA tax stamp. CMMG wraps the barrel in a 13.5-inch M-LOK handguard with a top Picatinny rail, and fits the DISSENT side-folding stock with an adjustable length of pull and cheek riser. The rifle features a forward non-reciprocating charging handle for quick manipulation without breaking the sight picture, and an adjustable gas block lets shooters dial in cycling for their preferred ammunition. It ships with two 30-round magazines and is finished in black, weighing about 9.6 pounds shipping weight. Among AR-platform rifles in the AR rifles category, the Dissent Mk4 favors shooters who want the shortest legal 5.56 build with a folding stock.

Key Specifications

• Chambered in 5.56mm NATO.
• Features a 14.5-inch barrel pinned and welded to a 16.1-inch overall length.
• Finished with a CMMG ZEROED SVD brake, permanently attached.
• Wrapped in a 13.5-inch M-LOK handguard with a top Picatinny rail.
• Fitted with a DISSENT side-folding stock, adjustable length of pull and cheek riser.
• Includes a forward non-reciprocating charging handle.
• Runs an adjustable gas block for tunable cycling.
• Ships with two 30-round magazines.
• Weighs approximately 9.6 pounds shipping weight.

Frequently Asked Questions

Why is the barrel pinned and welded? The 14.5-inch barrel carries a permanently attached CMMG ZEROED SVD brake, bringing the legal length to 16.1 inches without requiring an NFA tax stamp.

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

Buy the CMMG Dissent Mk4 5.56 NATO

CMMG’s shortest bufferless 5.56 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.